js-demo-adhoc-tool.py

# Dependencies and source files
files(
    name="package-config",
    sources=["package.json", "yarn.lock",],
    dependencies=[],
)

# The source files themselves
files(
    name="js-sources",
    sources=["*.js",],
    dependencies=[],
)

system_binary(
    name="yarn",
    binary_name="yarn",
    fingerprint=r"1\.22\.19",
    fingerprint_args=["--version"],
    fingerprint_dependencies=[_runnable(name="node", address=":node")],
)

system_binary(
    name="node",
    binary_name="node",
    fingerprint=r"v19.0.1",
    fingerprint_args=["--version"],
)

# Fetch the dependencies and produce a `node_modules` directory

adhoc_tool(
    name="node-modules-pinned",
    runnable=":yarn",
    args=["install", "--immutable"],
    dependencies=[":package-config"],
    execution_dependencies=[
        ":package-config", _runnable("node", ":node"),
    ],
    output_directories=["node_modules"],
    timeout=300,
)


shell_command(
    name="node-modules",
    command="yarn install --immutable",
    tools=[
        "yarn",
        "node",
    ],
    dependencies=[
        ":package-config",
    ],
    outputs=["node_modules/"],
    timeout=300,
)

# Minify the JS sources and dependencies into a single js file.
shell_command(
    name="build-js-app",
    command="yarn parcel build",
    tools=[
        "yarn",
        "node",
    ],
    dependencies=[":node-modules", ":js-sources",],
    outputs=["index.js", "index.js.map",],
    root_output_directory=".",
)

# Run the resulting JS file
run_shell_command(
    name="run-js-app",
    command="node {chroot}/index.js",
    execution_dependencies=[":build-js-app",],
)

# Demonstrate using the JS file as an input to an artifact
archive(
    name="packaged-js",
    format="tar",
    description="Package containing `index.js` file",
    files=[":build-js-app",],
)