JS project, fix target serialization

test/project_javascript/.github/workflows/test.yml

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+name: test
+
+on:
+  push:
+    branches:
+      - master
+      - main
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2.0.0
+      - uses: gleam-lang/setup-erlang@v1.1.2
+        with:
+          otp-version: 23.2
+      - uses: gleam-lang/setup-gleam@v1.0.2
+        with:
+          gleam-version: 0.18.0-dev
+      - run: gleam format --check src test
+      - run: gleam deps download
+      - run: gleam test

test/project_javascript/.gitignore

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+*.beam
+*.ez
+build

test/project_javascript/README.md

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+# Project
+
+A test Gleam project.
+
+It covers these features:
+
+- Downloading packages
+  - Specified in config.dependencies
+- Importing packages
+  - Specified in config.dependencies
+- Compilation of Gleam code
+  - in src
+  - in test
+- Importing Gleam src code into test
+
+These features are not tested yet
+
+- Downloading packages
+  - Specified in config.dev-dependencies
+- Importing packages
+  - Specified in config.dev-dependencies
+- Compilation of locally defined JavaScript modules
+  - in src
+  - in test
+- Importing Gleam src code into test
+
+## Quick start
+
+```sh
+gleam run
+gleam test
+```

test/project_javascript/gleam.toml

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+name = "project"
+version = "0.1.0"
+target = "javascript"
+
+[dependencies]
+gleam_stdlib = "~> 0.18"
+
+[dev-dependencies]

test/project_javascript/manifest.toml

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+# This file was generated by Gleam
+# You typically do not need to edit this file
+
+packages = [
+  { name = "gleam_stdlib", version = "0.18.0", build_tools = ["gleam"], requirements = [], otp_app = "gleam_stdlib", source = "hex", outer_checksum = "2938F996BBB25D75E973226846CDDFA33AB5590AFC8A9D043A356EA85272510D" },
+]
+
+[requirements]
+gleam_stdlib = "~> 0.18"

test/project_javascript/src/project.gleam

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+import gleam/io
+
+pub fn main() {
+  io.println("Hello, from the Gleam module!")
+  io.println(erlang_function())
+}
+
+external fn erlang_function() -> String =
+  "erlang_file" "main"

test/project_javascript/test/project_test.gleam

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+import gleam/io
+import project
+
+pub fn main() {
+  project.main()
+  io.println("Hello, from the Gleam test module!")
+}