Merge pull request #167 from Nadrieril/wasm

10 files changed, 222 insertions, 109 deletions

diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index b257115..c0be05c 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -56,3 +56,25 @@ jobs:
         with:
           command: test
 
+  test_wasm:
+    name: Run wasm tests
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        rust:
+          - stable
+    steps:
+      - name: Checkout branch
+        uses: actions/checkout@master
+        with:
+          submodules: true
+      - name: Setup Rust toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: ${{ matrix.rust }}
+          override: true
+      - name: Install wasm-pack
+        run: curl https://rustwasm.github.io/wasm-pack/installer/init.sh -sSf | sh
+      - name: Run tests
+        run: wasm-pack test serde_dhall --node
diff --git a/Cargo.lock b/Cargo.lock
index f4aab68..0fa3c4d 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -82,6 +82,18 @@ dependencies = [
 ]
 
 [[package]]
+name = "blocking"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "futures-channel 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "once_cell 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "parking 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "waker-fn 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "bumpalo"
 version = "3.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -112,6 +124,15 @@ version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "console_error_panic_hook"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.59 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "core-foundation"
 version = "0.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -140,6 +161,7 @@ version = "0.5.2"
 dependencies = [
  "abnf_to_pest 0.5.0",
  "annotate-snippets 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "blocking 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "hex 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "itertools 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -246,43 +268,54 @@ version = "0.3.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "futures"
+version = "0.1.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "futures-channel"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
 name = "futures-core"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "futures-io"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "futures-sink"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "futures-task"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "once_cell 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
+]
 
 [[package]]
 name = "futures-util"
-version = "0.3.4"
+version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-io 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-task 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-io 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-task 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "pin-utils 0.1.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pin-project 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "pin-utils 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -311,14 +344,14 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "fnv 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-sink 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-util 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "indexmap 1.3.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-util 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -329,7 +362,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "hermit-abi"
-version = "0.1.8"
+version = "0.1.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "libc 0.2.68 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -370,9 +403,9 @@ version = "0.13.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-channel 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-util 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-channel 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "h2 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "http-body 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -382,7 +415,7 @@ dependencies = [
  "net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-project 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "tower-service 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "want 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -395,7 +428,7 @@ dependencies = [
  "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.13.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "native-tls 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tls 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -606,10 +639,10 @@ dependencies = [
 
 [[package]]
 name = "num_cpus"
-version = "1.12.0"
+version = "1.13.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
- "hermit-abi 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)",
+ "hermit-abi 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)",
  "libc 0.2.68 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
@@ -662,6 +695,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "parking"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "percent-encoding"
 version = "1.0.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -757,7 +795,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "pin-utils"
-version = "0.1.0-alpha.4"
+version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
@@ -915,8 +953,8 @@ dependencies = [
  "base64 0.11.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "encoding_rs 0.8.22 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-util 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-util 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "http 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "http-body 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "hyper 0.13.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -932,7 +970,7 @@ dependencies = [
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde_urlencoded 0.6.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
  "tokio-tls 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "wasm-bindgen 0.2.59 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -972,6 +1010,11 @@ dependencies = [
 ]
 
 [[package]]
+name = "scoped-tls"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "security-framework"
 version = "0.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1044,10 +1087,10 @@ dependencies = [
  "dhall 0.5.2",
  "dhall_proc_macros 0.5.0",
  "doc-comment 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
- "reqwest 0.10.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.104 (registry+https://github.com/rust-lang/crates.io-index)",
  "url 2.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "version-sync 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-test 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1161,7 +1204,7 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "0.2.13"
+version = "0.2.21"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -1170,7 +1213,7 @@ dependencies = [
  "lazy_static 1.4.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "memchr 2.3.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.21 (registry+https://github.com/rust-lang/crates.io-index)",
- "num_cpus 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "num_cpus 1.13.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-project-lite 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
  "slab 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
@@ -1181,7 +1224,7 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "native-tls 0.2.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1190,11 +1233,11 @@ version = "0.2.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
  "bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "futures-sink 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-core 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures-sink 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "pin-project-lite 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)",
- "tokio 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)",
+ "tokio 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)",
 ]
 
 [[package]]
@@ -1310,6 +1353,11 @@ version = "0.9.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "waker-fn"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
 name = "walkdir"
 version = "2.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1360,6 +1408,18 @@ dependencies = [
 
 [[package]]
 name = "wasm-bindgen-futures"
+version = "0.3.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "js-sys 0.3.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.59 (registry+https://github.com/rust-lang/crates.io-index)",
+ "web-sys 0.3.36 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wasm-bindgen-futures"
 version = "0.4.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 dependencies = [
@@ -1396,6 +1456,29 @@ version = "0.2.59"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
+name = "wasm-bindgen-test"
+version = "0.2.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "console_error_panic_hook 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)",
+ "js-sys 0.3.36 (registry+https://github.com/rust-lang/crates.io-index)",
+ "scoped-tls 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen 0.2.59 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-futures 0.3.27 (registry+https://github.com/rust-lang/crates.io-index)",
+ "wasm-bindgen-test-macro 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "wasm-bindgen-test-macro"
+version = "0.2.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "proc-macro2 0.4.30 (registry+https://github.com/rust-lang/crates.io-index)",
+ "quote 0.6.13 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
 name = "web-sys"
 version = "0.3.36"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1469,12 +1552,14 @@ dependencies = [
 "checksum bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)" = "cf1de2fe8c75bc145a2f577add951f8134889b4795d47466a54a5c846d691693"
 "checksum block-buffer 0.7.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c0940dc441f31689269e10ac70eb1002a3a1d3ad1390e030043662eb7fe4688b"
 "checksum block-padding 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)" = "fa79dedbb091f449f1f39e53edf88d5dbe95f895dae6135a8d7b881fb5af73f5"
+"checksum blocking 0.4.3 (registry+https://github.com/rust-lang/crates.io-index)" = "f057b031309deb5469940f4acf48b652b0d69119069ae6c8392b8e15c5396798"
 "checksum bumpalo 3.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1f359dc14ff8911330a51ef78022d376f25ed00248912803b58f00cb1c27f742"
 "checksum byte-tools 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "e3b5ca7a04898ad4bcd41c90c5285445ff5b791899bb1b0abdd2a2aa791211d7"
 "checksum byteorder 1.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "08c48aae112d48ed9f069b33538ea9e3e90aa263cfa3d1c24309612b1f7472de"
 "checksum bytes 0.5.4 (registry+https://github.com/rust-lang/crates.io-index)" = "130aac562c0dd69c56b3b1cc8ffd2e17be31d0b6c25b61c96b76231aa23e39e1"
 "checksum cc 1.0.50 (registry+https://github.com/rust-lang/crates.io-index)" = "95e28fa049fda1c330bcf9d723be7663a899c4679724b34c81e9f5a326aab8cd"
 "checksum cfg-if 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)" = "b486ce3ccf7ffd79fdeb678eac06a9e6c09fc88d33836340becb8fffe87c5e33"
+"checksum console_error_panic_hook 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)" = "b8d976903543e0c48546a91908f21588a680a8c8f984df9a5d69feccb2b2a211"
 "checksum core-foundation 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "57d24c7a13c43e870e37c1556b74555437870a04514f7685f5b354e090567171"
 "checksum core-foundation-sys 0.7.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b3a71ab494c0b5b860bdc8407ae08978052417070c2ced38573a9157ad75b8ac"
 "checksum ctor 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "47c5e5ac752e18207b12e16b10631ae5f7f68f8805f335f9b817ead83d9ffce1"
@@ -1490,17 +1575,18 @@ dependencies = [
 "checksum foreign-types-shared 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
 "checksum fuchsia-zircon 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2e9763c69ebaae630ba35f74888db465e49e259ba1bc0eda7d06f4a067615d82"
 "checksum fuchsia-zircon-sys 0.3.3 (registry+https://github.com/rust-lang/crates.io-index)" = "3dcaa9ae7725d12cdb85b3ad99a434db70b468c09ded17e012d86b5c1010f7a7"
-"checksum futures-channel 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "f0c77d04ce8edd9cb903932b608268b3fffec4163dc053b3b402bf47eac1f1a8"
-"checksum futures-core 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "f25592f769825e89b92358db00d26f965761e094951ac44d3663ef25b7ac464a"
-"checksum futures-io 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "a638959aa96152c7a4cddf50fcb1e3fede0583b27157c26e67d6f99904090dc6"
-"checksum futures-sink 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "3466821b4bc114d95b087b850a724c6f83115e929bc88f1fa98a3304a944c8a6"
-"checksum futures-task 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "7b0a34e53cf6cdcd0178aa573aed466b646eb3db769570841fda0c7ede375a27"
-"checksum futures-util 0.3.4 (registry+https://github.com/rust-lang/crates.io-index)" = "22766cf25d64306bedf0384da004d05c9974ab104fcc4528f1236181c18004c5"
+"checksum futures 0.1.29 (registry+https://github.com/rust-lang/crates.io-index)" = "1b980f2816d6ee8673b6517b52cb0e808a180efc92e5c19d02cdda79066703ef"
+"checksum futures-channel 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "f366ad74c28cca6ba456d95e6422883cfb4b252a83bed929c83abfdbbf2967d5"
+"checksum futures-core 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "59f5fff90fd5d971f936ad674802482ba441b6f09ba5e15fd8b39145582ca399"
+"checksum futures-io 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "de27142b013a8e869c14957e6d2edeef89e97c289e69d042ee3a49acd8b51789"
+"checksum futures-sink 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "3f2032893cb734c7a05d85ce0cc8b8c4075278e93b24b66f9de99d6eb0fa8acc"
+"checksum futures-task 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "bdb66b5f09e22019b1ab0830f7785bcea8e7a42148683f99214f73f8ec21a626"
+"checksum futures-util 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)" = "8764574ff08b701a084482c3c7031349104b07ac897393010494beaa18ce32c6"
 "checksum generic-array 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)" = "c68f0274ae0e023facc3c97b2e00f076be70e254bc851d972503b328db79b2ec"
 "checksum getrandom 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "7abc8dd8451921606d809ba32e95b6111925cd2906060d2dcc29c070220503eb"
 "checksum h2 0.2.2 (registry+https://github.com/rust-lang/crates.io-index)" = "9d5c295d1c0c68e4e42003d75f908f5e16a1edd1cbe0b0d02e4dc2006a384f47"
 "checksum half 1.5.0 (registry+https://github.com/rust-lang/crates.io-index)" = "f36b5f248235f45773d4944f555f83ea61fe07b18b561ccf99d7483d7381e54d"
-"checksum hermit-abi 0.1.8 (registry+https://github.com/rust-lang/crates.io-index)" = "1010591b26bbfe835e9faeabeb11866061cc7dcebffd56ad7d0942d0e61aefd8"
+"checksum hermit-abi 0.1.13 (registry+https://github.com/rust-lang/crates.io-index)" = "91780f809e750b0a89f5544be56617ff6b1227ee485bcb06ebe10cdf89bd3b71"
 "checksum hex 0.4.2 (registry+https://github.com/rust-lang/crates.io-index)" = "644f9158b2f133fd50f5fb3242878846d9eb792e445c893805ff0e3824006e35"
 "checksum http 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "b708cc7f06493459026f53b9a61a7a121a5d1ec6238dee58ea4941132b30156b"
 "checksum http-body 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "13d5ff830006f7646652e057693569bfe0d51760c0085a071769d142a205111b"
@@ -1531,13 +1617,14 @@ dependencies = [
 "checksum net2 0.2.33 (registry+https://github.com/rust-lang/crates.io-index)" = "42550d9fb7b6684a6d404d9fa7250c2eb2646df731d1c06afc06dcee9e1bcf88"
 "checksum nodrop 0.1.14 (registry+https://github.com/rust-lang/crates.io-index)" = "72ef4a56884ca558e5ddb05a1d1e7e1bfd9a68d9ed024c21704cc98872dae1bb"
 "checksum nom 5.1.1 (registry+https://github.com/rust-lang/crates.io-index)" = "0b471253da97532da4b61552249c521e01e736071f71c1a4f7ebbfbf0a06aad6"
-"checksum num_cpus 1.12.0 (registry+https://github.com/rust-lang/crates.io-index)" = "46203554f085ff89c235cd12f7075f3233af9b11ed7c9e16dfe2560d03313ce6"
+"checksum num_cpus 1.13.0 (registry+https://github.com/rust-lang/crates.io-index)" = "05499f3756671c15885fee9034446956fff3f243d6077b91e5767df161f766b3"
 "checksum once_cell 1.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "b1c601810575c99596d4afc46f78a678c80105117c379eb3650cf99b8a21ce5b"
 "checksum opaque-debug 0.2.3 (registry+https://github.com/rust-lang/crates.io-index)" = "2839e79665f131bdb5782e51f2c6c9599c133c6098982a54c794358bf432529c"
 "checksum openssl 0.10.28 (registry+https://github.com/rust-lang/crates.io-index)" = "973293749822d7dd6370d6da1e523b0d1db19f06c459134c658b2a4261378b52"
 "checksum openssl-probe 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "77af24da69f9d9341038eba93a073b1fdaaa1b788221b00a69bce9e762cb32de"
 "checksum openssl-sys 0.9.54 (registry+https://github.com/rust-lang/crates.io-index)" = "1024c0a59774200a555087a6da3f253a9095a5f344e353b212ac4c8b8e450986"
 "checksum output_vt100 0.1.2 (registry+https://github.com/rust-lang/crates.io-index)" = "53cdc5b785b7a58c5aad8216b3dfa114df64b0b06ae6e1501cef91df2fbdf8f9"
+"checksum parking 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "9a7fad362df89617628a7508b3e9d588ade1b0ac31aa25de168193ad999c2dd4"
 "checksum percent-encoding 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "31010dd2e1ac33d5b46a5b413495239882813e0369f8ed8a5e266f173602f831"
 "checksum percent-encoding 2.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "d4fd5641d01c8f18a23da7b6fe29298ff4b55afcccdf78973b24cf3175fee32e"
 "checksum pest 2.1.3 (registry+https://github.com/rust-lang/crates.io-index)" = "10f4872ae94d7b90ae48754df22fd42ad52ce740b8f370b03da4835417403e53"
@@ -1549,7 +1636,7 @@ dependencies = [
 "checksum pin-project 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "7804a463a8d9572f13453c516a5faea534a2403d7ced2f0c7e100eeff072772c"
 "checksum pin-project-internal 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)" = "385322a45f2ecf3410c68d2a549a4a2685e8051d0f278e39743ff4e451cb9b3f"
 "checksum pin-project-lite 0.1.4 (registry+https://github.com/rust-lang/crates.io-index)" = "237844750cfbb86f67afe27eee600dfbbcb6188d734139b534cbfbf4f96792ae"
-"checksum pin-utils 0.1.0-alpha.4 (registry+https://github.com/rust-lang/crates.io-index)" = "5894c618ce612a3fa23881b152b608bafb8c56cfc22f434a3ba3120b40f7b587"
+"checksum pin-utils 0.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 "checksum pkg-config 0.3.17 (registry+https://github.com/rust-lang/crates.io-index)" = "05da548ad6865900e60eaba7f589cc0783590a92e940c26953ff81ddbab2d677"
 "checksum ppv-lite86 0.2.6 (registry+https://github.com/rust-lang/crates.io-index)" = "74490b50b9fbe561ac330df47c08f3f33073d2d00c150f719147d7c54522fa1b"
 "checksum pretty 0.5.2 (registry+https://github.com/rust-lang/crates.io-index)" = "f60c0d9f6fc88ecdd245d90c1920ff76a430ab34303fc778d33b1d0a4c3bf6d3"
@@ -1573,6 +1660,7 @@ dependencies = [
 "checksum ryu 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)" = "535622e6be132bccd223f4bb2b8ac8d53cda3c7a6394944d3b2b33fb974f9d76"
 "checksum same-file 1.0.6 (registry+https://github.com/rust-lang/crates.io-index)" = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
 "checksum schannel 0.1.17 (registry+https://github.com/rust-lang/crates.io-index)" = "507a9e6e8ffe0a4e0ebb9a10293e62fdf7657c06f1b8bb07a8fcf697d2abf295"
+"checksum scoped-tls 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "ea6a9290e3c9cf0f18145ef7ffa62d68ee0bf5fcd651017e586dc7fd5da448c2"
 "checksum security-framework 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "97bbedbe81904398b6ebb054b3e912f99d55807125790f3198ac990d98def5b0"
 "checksum security-framework-sys 0.4.1 (registry+https://github.com/rust-lang/crates.io-index)" = "06fd2f23e31ef68dd2328cc383bd493142e46107a3a0e24f7d734e3f3b80fe4c"
 "checksum semver 0.9.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1d7eb9ef2c18661902cc47e535f9bc51b78acd254da71d375c2f6720d9a40403"
@@ -1593,7 +1681,7 @@ dependencies = [
 "checksum tempfile 3.1.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7a6e24d9338a0a5be79593e2fa15a648add6138caa803e2d5bc782c371732ca9"
 "checksum thread_local 1.0.1 (registry+https://github.com/rust-lang/crates.io-index)" = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
 "checksum time 0.1.42 (registry+https://github.com/rust-lang/crates.io-index)" = "db8dcfca086c1143c9270ac42a2bbd8a7ee477b78ac8e45b19abfb0cbede4b6f"
-"checksum tokio 0.2.13 (registry+https://github.com/rust-lang/crates.io-index)" = "0fa5e81d6bc4e67fe889d5783bd2a128ab2e0cfa487e0be16b6a8d177b101616"
+"checksum tokio 0.2.21 (registry+https://github.com/rust-lang/crates.io-index)" = "d099fa27b9702bed751524694adbe393e18b36b204da91eb1cbbbbb4a5ee2d58"
 "checksum tokio-tls 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "7bde02a3a5291395f59b06ec6945a3077602fac2b07eeeaf0dee2122f3619828"
 "checksum tokio-util 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)" = "571da51182ec208780505a32528fc5512a8fe1443ab960b3f2f3ef093cd16930"
 "checksum toml 0.5.6 (registry+https://github.com/rust-lang/crates.io-index)" = "ffc92d160b1eef40665be3a05630d003936a3bc7da7421277846c2613e92c71a"
@@ -1612,15 +1700,19 @@ dependencies = [
 "checksum vcpkg 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "3fc439f2794e98976c88a2a2dafce96b930fe8010b0a256b3c2199a773933168"
 "checksum version-sync 0.8.1 (registry+https://github.com/rust-lang/crates.io-index)" = "844f3d3a2467f15cb999f5af7775f6e108ac546d4f42365832ed4c755404f806"
 "checksum version_check 0.9.1 (registry+https://github.com/rust-lang/crates.io-index)" = "078775d0255232fb988e6fccf26ddc9d1ac274299aaedcedce21c6f72cc533ce"
+"checksum waker-fn 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)" = "9571542c2ce85ce642e6b58b3364da2fb53526360dfb7c211add4f5c23105ff7"
 "checksum walkdir 2.3.1 (registry+https://github.com/rust-lang/crates.io-index)" = "777182bc735b6424e1a57516d35ed72cb8019d85c8c9bf536dccb3445c1a2f7d"
 "checksum want 0.3.0 (registry+https://github.com/rust-lang/crates.io-index)" = "1ce8a968cb1cd110d136ff8b819a556d6fb6d919363c61534f6860c7eb172ba0"
 "checksum wasi 0.9.0+wasi-snapshot-preview1 (registry+https://github.com/rust-lang/crates.io-index)" = "cccddf32554fecc6acb585f82a32a72e28b48f8c4c1883ddfeeeaa96f7d8e519"
 "checksum wasm-bindgen 0.2.59 (registry+https://github.com/rust-lang/crates.io-index)" = "3557c397ab5a8e347d434782bcd31fc1483d927a6826804cec05cc792ee2519d"
 "checksum wasm-bindgen-backend 0.2.59 (registry+https://github.com/rust-lang/crates.io-index)" = "e0da9c9a19850d3af6df1cb9574970b566d617ecfaf36eb0b706b6f3ef9bd2f8"
+"checksum wasm-bindgen-futures 0.3.27 (registry+https://github.com/rust-lang/crates.io-index)" = "83420b37346c311b9ed822af41ec2e82839bfe99867ec6c54e2da43b7538771c"
 "checksum wasm-bindgen-futures 0.4.9 (registry+https://github.com/rust-lang/crates.io-index)" = "457414a91863c0ec00090dba537f88ab955d93ca6555862c29b6d860990b8a8a"
 "checksum wasm-bindgen-macro 0.2.59 (registry+https://github.com/rust-lang/crates.io-index)" = "0f6fde1d36e75a714b5fe0cffbb78978f222ea6baebb726af13c78869fdb4205"
 "checksum wasm-bindgen-macro-support 0.2.59 (registry+https://github.com/rust-lang/crates.io-index)" = "25bda4168030a6412ea8a047e27238cadf56f0e53516e1e83fec0a8b7c786f6d"
 "checksum wasm-bindgen-shared 0.2.59 (registry+https://github.com/rust-lang/crates.io-index)" = "fc9f36ad51f25b0219a3d4d13b90eb44cd075dff8b6280cca015775d7acaddd8"
+"checksum wasm-bindgen-test 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)" = "a2d9693b63a742d481c7f80587e057920e568317b2806988c59cd71618bc26c1"
+"checksum wasm-bindgen-test-macro 0.2.50 (registry+https://github.com/rust-lang/crates.io-index)" = "0789dac148a8840bbcf9efe13905463b733fa96543bfbf263790535c11af7ba5"
 "checksum web-sys 0.3.36 (registry+https://github.com/rust-lang/crates.io-index)" = "721c6263e2c66fd44501cc5efbfa2b7dfa775d13e4ea38c46299646ed1f9c70a"
 "checksum winapi 0.2.8 (registry+https://github.com/rust-lang/crates.io-index)" = "167dc9d6949a9b857f3451275e911c3f44255842c1f7a76f33c55103a909087a"
 "checksum winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)" = "8093091eeb260906a183e6ae1abdba2ef5ef2257a21801128899c3fc699229c6"
diff --git a/README.md b/README.md
index ab8109d..7b370ff 100644
--- a/README.md
+++ b/README.md
@@ -169,6 +169,8 @@ same name as the corresponding test.
 
 #### [Unreleased]
 
+- Support building to wasm
+
 #### [0.5.2] - 2020-04-12
 
 - Fix #162
diff --git a/dhall/Cargo.toml b/dhall/Cargo.toml
index 376506f..adf92d6 100644
--- a/dhall/Cargo.toml
+++ b/dhall/Cargo.toml
@@ -19,13 +19,20 @@ once_cell = "1.3.1"
 percent-encoding = "2.1.0"
 pest = "2.1"
 pest_consume = "1.0"
-reqwest = { version = "0.10", features = ["blocking"] }
 serde = "1.0"
 serde_cbor = "0.9.0"
 sha2 = "0.8.1"
 smallvec = "1.0.0"
 url = "2.1"
 
+[target.'cfg(not(target_arch = "wasm32"))'.dependencies]
+reqwest = { version = "0.10", features = ["blocking"] }
+
+[target.'cfg(target_arch = "wasm32")'.dependencies]
+# Disable native tls because hyper doesn't build on wasm
+reqwest = { version = "0.10", default-features = false }
+blocking = "0.4.3"
+
 [dev-dependencies]
 pretty_assertions = "0.6.1"
 version-sync = "0.8"
diff --git a/dhall/src/semantics/parse.rs b/dhall/src/semantics/parse.rs
index 2326471..82396e0 100644
--- a/dhall/src/semantics/parse.rs
+++ b/dhall/src/semantics/parse.rs
@@ -4,7 +4,7 @@ use std::path::Path;
 use url::Url;
 
 use crate::error::Error;
-use crate::semantics::resolve::ImportLocation;
+use crate::semantics::resolve::{download_http_text, ImportLocation};
 use crate::syntax::binary;
 use crate::syntax::parse_expr;
 use crate::Parsed;
@@ -17,7 +17,7 @@ pub fn parse_file(f: &Path) -> Result<Parsed, Error> {
 }
 
 pub fn parse_remote(url: Url) -> Result<Parsed, Error> {
-    let body = reqwest::blocking::get(url.clone()).unwrap().text().unwrap();
+    let body = download_http_text(url.clone())?;
     let expr = parse_expr(&body)?;
     let root = ImportLocation::Remote(url);
     Ok(Parsed(expr, root))
diff --git a/dhall/src/semantics/resolve/cache.rs b/dhall/src/semantics/resolve/cache.rs
index b725bf3..164baea 100644
--- a/dhall/src/semantics/resolve/cache.rs
+++ b/dhall/src/semantics/resolve/cache.rs
@@ -12,36 +12,32 @@ use std::env::VarError;
 use std::ffi::OsStr;
 use std::fs::File;
 
+#[cfg(any(unix, windows))]
+const CACHE_ENV_VAR: &str = "XDG_CACHE_HOME";
 #[cfg(unix)]
-const ALTERNATE_ENV_VAR: &str = "HOME";
-
+const ALTERNATE_CACHE_ENV_VAR: &str = "HOME";
 #[cfg(windows)]
-const ALTERNATE_ENV_VAR: &str = "LOCALAPPDATA";
-
-fn alternate_env_var_cache_dir(
-    provider: impl Fn(&str) -> Result<String, VarError>,
-) -> Option<PathBuf> {
-    provider(ALTERNATE_ENV_VAR)
-        .map(PathBuf::from)
-        .map(|env_dir| env_dir.join(".cache").join("dhall"))
-        .ok()
-}
+const ALTERNATE_CACHE_ENV_VAR: &str = "LOCALAPPDATA";
 
-fn env_var_cache_dir(
-    provider: impl Fn(&str) -> Result<String, VarError>,
-) -> Option<PathBuf> {
-    provider("XDG_CACHE_HOME")
-        .map(PathBuf::from)
-        .map(|cache_home| cache_home.join("dhall"))
-        .ok()
+#[cfg(any(unix, windows))]
+fn load_cache_dir(
+    env_provider: impl Fn(&str) -> Result<String, VarError> + Copy,
+) -> Result<PathBuf, CacheError> {
+    let env_provider = |s| {
+        env_provider(s)
+            .map(PathBuf::from)
+            .map_err(|_| CacheError::MissingConfiguration)
+    };
+    let cache_base_path = env_provider(CACHE_ENV_VAR).or_else(|_| {
+        env_provider(ALTERNATE_CACHE_ENV_VAR).map(|path| path.join(".cache"))
+    })?;
+    Ok(cache_base_path.join("dhall"))
 }
-
+#[cfg(not(any(unix, windows)))]
 fn load_cache_dir(
-    provider: impl Fn(&str) -> Result<String, VarError> + Copy,
+    _provider: impl Fn(&str) -> Result<String, VarError> + Copy,
 ) -> Result<PathBuf, CacheError> {
-    env_var_cache_dir(provider)
-        .or_else(|| alternate_env_var_cache_dir(provider))
-        .ok_or(CacheError::MissingConfiguration)
+    Err(CacheError::MissingConfiguration)
 }
 
 #[derive(Debug, PartialEq)]
@@ -184,41 +180,11 @@ mod test {
     use rand::Rng;
     use std::env::temp_dir;
 
-    #[cfg(unix)]
-    #[test]
-    fn alternate_env_var_cache_dir_should_result_unix_folder_path() {
-        let actual =
-            alternate_env_var_cache_dir(|_| Ok("/home/user".to_string()));
-        assert_eq!(actual, Some(PathBuf::from("/home/user/.cache/dhall")));
-    }
-
-    #[test]
-    fn alternate_env_var_cache_dir_should_result_none_on_missing_var() {
-        let actual = alternate_env_var_cache_dir(|_| Err(VarError::NotPresent));
-        assert_eq!(actual, None);
-    }
-
-    #[test]
-    fn env_var_cache_dir_should_result_xdg_cache_home() {
-        let actual = env_var_cache_dir(|_| {
-            Ok("/home/user/custom/path/for/cache".to_string())
-        });
-        assert_eq!(
-            actual,
-            Some(PathBuf::from("/home/user/custom/path/for/cache/dhall"))
-        );
-    }
-
-    #[test]
-    fn env_var_cache_dir_should_result_none_on_missing_var() {
-        let actual = env_var_cache_dir(|_| Err(VarError::NotPresent));
-        assert_eq!(actual, None);
-    }
-
+    #[cfg(any(unix, windows))]
     #[test]
     fn load_cache_dir_should_result_xdg_cache_first() {
         let actual = load_cache_dir(|var| match var {
-            "XDG_CACHE_HOME" => Ok("/home/user/custom".to_string()),
+            CACHE_ENV_VAR => Ok("/home/user/custom".to_string()),
             _ => Err(VarError::NotPresent),
         });
         assert_eq!(actual.unwrap(), PathBuf::from("/home/user/custom/dhall"));
@@ -228,7 +194,7 @@ mod test {
     #[test]
     fn load_cache_dir_should_result_alternate() {
         let actual = load_cache_dir(|var| match var {
-            ALTERNATE_ENV_VAR => Ok("/home/user".to_string()),
+            ALTERNATE_CACHE_ENV_VAR => Ok("/home/user".to_string()),
             _ => Err(VarError::NotPresent),
         });
         assert_eq!(actual.unwrap(), PathBuf::from("/home/user/.cache/dhall"));
diff --git a/dhall/src/semantics/resolve/resolve.rs b/dhall/src/semantics/resolve/resolve.rs
index 3b72b9e..fb770db 100644
--- a/dhall/src/semantics/resolve/resolve.rs
+++ b/dhall/src/semantics/resolve/resolve.rs
@@ -159,9 +159,7 @@ impl ImportLocation {
     fn fetch_text(self) -> Result<String, Error> {
         Ok(match self {
             ImportLocation::Local(path) => std::fs::read_to_string(&path)?,
-            ImportLocation::Remote(url) => {
-                reqwest::blocking::get(url).unwrap().text().unwrap()
-            }
+            ImportLocation::Remote(url) => download_http_text(url)?,
             ImportLocation::Env(var_name) => match env::var(var_name) {
                 Ok(val) => val,
                 Err(_) => return Err(ImportError::MissingEnvVar.into()),
@@ -197,6 +195,18 @@ fn mkexpr(kind: UnspannedExpr) -> Expr {
     Expr::new(kind, Span::Artificial)
 }
 
+// TODO: error handling
+#[cfg(not(target_arch = "wasm32"))]
+pub(crate) fn download_http_text(url: Url) -> Result<String, Error> {
+    Ok(reqwest::blocking::get(url).unwrap().text().unwrap())
+}
+#[cfg(target_arch = "wasm32")]
+pub(crate) fn download_http_text(url: Url) -> Result<String, Error> {
+    blocking::block_on(async {
+        Ok(reqwest::get(url).await.unwrap().text().await.unwrap())
+    })
+}
+
 fn make_aslocation_uniontype() -> Expr {
     let text_type = mkexpr(ExprKind::Builtin(Builtin::Text));
     let mut union = BTreeMap::default();
diff --git a/serde_dhall/Cargo.toml b/serde_dhall/Cargo.toml
index 6842209..05a7255 100644
--- a/serde_dhall/Cargo.toml
+++ b/serde_dhall/Cargo.toml
@@ -15,8 +15,10 @@ serde = { version = "1.0", features = ["derive"] }
 dhall = { version = "= 0.5.2", path = "../dhall" }
 dhall_proc_macros = { version = "= 0.5.0", path = "../dhall_proc_macros" }
 doc-comment = "0.3"
-reqwest = { version = "0.10", features = ["blocking"] }
 url = "2.1"
 
+[target.'cfg(target_arch = "wasm32")'.dev-dependencies]
+wasm-bindgen-test = "0.2"
+
 [dev-dependencies]
 version-sync = "0.8"
diff --git a/serde_dhall/tests/de.rs b/serde_dhall/tests/de.rs
index 1932e26..a418563 100644
--- a/serde_dhall/tests/de.rs
+++ b/serde_dhall/tests/de.rs
@@ -21,7 +21,7 @@ fn test_de_typed() {
     assert_eq!(parse::<f32>("1.0"), 1.0);
 
     assert_eq!(parse::<String>(r#""foo""#), "foo".to_owned());
-    assert_eq!(parse::<Vec<u64>>("[] : List Natural"), vec![]);
+    assert_eq!(parse::<Vec<u64>>("[] : List Natural"), <Vec<u64>>::new());
     assert_eq!(parse::<Vec<u64>>("[1, 2]"), vec![1, 2]);
     assert_eq!(parse::<Option<u64>>("None Natural"), None);
     assert_eq!(parse::<Option<u64>>("Some 1"), Some(1));
diff --git a/serde_dhall/tests/wasm.rs b/serde_dhall/tests/wasm.rs
new file mode 100644
index 0000000..c719d84
--- /dev/null
+++ b/serde_dhall/tests/wasm.rs
@@ -0,0 +1,12 @@
+#![cfg(target_arch = "wasm32")]
+use wasm_bindgen_test::*;
+
+use serde_dhall::{from_str, FromDhall, StaticType};
+
+#[wasm_bindgen_test]
+fn test() {
+    fn parse<T: FromDhall + StaticType>(s: &str) -> T {
+        from_str(s).static_type_annotation().parse().unwrap()
+    }
+    assert_eq!(parse::<Vec<u64>>("[1, 2]"), vec![1, 2]);
+}