What's the status of this PR, @kt3k? Please close if stale.

Closes #10770. Fixes #11141. Fixes #11206.

Makes Deno.emit() output code, source maps, declaration files etc. as a list of structured module entries instead of a dictionary of magical file names. Breaks out Deno.emitBundle() as a new API, since it has a different output structure.

Deno.emit()

console.log(
  await Deno.emit("https://deno.land/std@0.97.0/testing/asserts.ts", {
    compilerOptions: { declaration: true },
  }),
);

Before:

{
  files: {
    "https://deno.land/std@0.97.0/testing/_diff.ts.js.map": '{"version":3,"file":"_diff.js","sourceRoot":"","sources":["https://deno.land/std@0.97.0/testing/_dif...',
    "https://deno.land/std@0.97.0/testing/_diff.ts.js": 'export var DiffType;\n(function (DiffType) {\n    DiffType["removed"] = "removed";\n    DiffType["commo...',
    "https://deno.land/std@0.97.0/fmt/colors.ts.js.map": '{"version":3,"file":"colors.js","sourceRoot":"","sources":["https://deno.land/std@0.97.0/fmt/colors....',
    "https://deno.land/std@0.97.0/testing/asserts.ts.d.ts": '/// <amd-module name="https://deno.land/std@0.97.0/testing/asserts.ts" />\ninterface Constructor {\n  ...',
    "https://deno.land/std@0.97.0/testing/asserts.ts.js": 'import { bold, gray, green, red, stripColor, white } from "../fmt/colors.ts";\nimport { diff, DiffTyp...',
    "https://deno.land/std@0.97.0/fmt/colors.ts.d.ts": '/// <amd-module name="https://deno.land/std@0.97.0/fmt/colors.ts" />\ninterface Rgb {\n    r: number;\n...',
    "https://deno.land/std@0.97.0/fmt/colors.ts.js": "const noColor = globalThis.Deno?.noColor ?? true;\nlet enabled = !noColor;\nexport function setColorEn...",
    "https://deno.land/std@0.97.0/testing/asserts.ts.js.map": '{"version":3,"file":"asserts.js","sourceRoot":"","sources":["https://deno.land/std@0.97.0/testing/as...',
    "https://deno.land/std@0.97.0/testing/_diff.ts.d.ts": '/// <amd-module name="https://deno.land/std@0.97.0/testing/_diff.ts" />\nexport declare enum DiffType...'
  },
  // ...
}

After:

{
  modules: [
    {
      specifier: "https://deno.land/std@0.97.0/fmt/colors.ts",
      code: "const noColor = globalThis.Deno?.noColor ?? true;\nlet enabled = !noColor;\nexport function setColorEn...",
      map: '{"version":3,"file":"colors.js","sourceRoot":"","sources":["https://deno.land/std@0.97.0/fmt/colors....',
      declaration: '/// <amd-module name="https://deno.land/std@0.97.0/fmt/colors.ts" />\ninterface Rgb {\n    r: number;\n...'
    },
    {
      specifier: "https://deno.land/std@0.97.0/testing/asserts.ts",
      code: 'import { bold, gray, green, red, stripColor, white } from "../fmt/colors.ts";\nimport { diff, DiffTyp...',
      map: '{"version":3,"file":"asserts.js","sourceRoot":"","sources":["https://deno.land/std@0.97.0/testing/as...',
      declaration: '/// <amd-module name="https://deno.land/std@0.97.0/testing/asserts.ts" />\ninterface Constructor {\n  ...'
    },
    {
      specifier: "https://deno.land/std@0.97.0/testing/_diff.ts",
      code: 'export var DiffType;\n(function (DiffType) {\n    DiffType["removed"] = "removed";\n    DiffType["commo...',
      map: '{"version":3,"file":"_diff.js","sourceRoot":"","sources":["https://deno.land/std@0.97.0/testing/_dif...',
      declaration: '/// <amd-module name="https://deno.land/std@0.97.0/testing/_diff.ts" />\nexport declare enum DiffType...'
    }
  ],
  // ...
}

Deno.emitBundle()

Before:

console.log(
  await Deno.emit("https://deno.land/std@0.97.0/testing/asserts.ts", {
    bundle: "module",
  }),
);

{
  files: {
    "deno:///bundle.js.map": '{"version":3,"sources":["<https://deno.land/std@0.97.0/fmt/colors.ts>","<https://deno.land/std@0.97....',
    "deno:///bundle.js": "const noColor = globalThis.Deno?.noColor ?? true;\nlet enabled = !noColor;\nfunction code(open, close)..."
  },
  // ...
}

After:

console.log(
  await Deno.emitBundle("https://deno.land/std@0.97.0/testing/asserts.ts"),
);

{
  code: "const noColor = globalThis.Deno?.noColor ?? true;\nlet enabled = !noColor;\nfunction code(open, close)...",
  map: '{"version":3,"sources":["<https://deno.land/std@0.97.0/fmt/colors.ts>","<https://deno.land/std@0.97....',
  // ...
}

cc @kitsonk. This redoes #10767 with errors reported on the module entries instead of as diagnostics.

@nayeemrmn We are looking into deprecating and removing Deno.emit because we don't want the runtime APIs to be so closely linked with TypeScript and nitty gritty compiler functionality. We would rather have Deno.emit be available as a userland API, likely utilizing deno_graph in wasm. That's all to say, I don't want to iterate further on a potentially-dead API right now. Thanks for the patch, but ideally this is done outside the runtime. Closing without merge.

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And move the Arc inside the struct.

Why isn't it? Matches what we do in Deploy

<!-- Before submitting a PR, please read http://deno.land/manual/contributing

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2. Ensure there is a related issue and it is referenced in the PR text.
3. Ensure there are tests that cover the changes.
4. Ensure cargo test passes.
5. Ensure ./tools/format.js passes without changing files.
6. Ensure ./tools/lint.js passes. -->

And move the Arc inside the struct.

<!-- Before submitting a PR, please read http://deno.land/manual/contributing

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2. Ensure there is a related issue and it is referenced in the PR text.
3. Ensure there are tests that cover the changes.
4. Ensure cargo test passes.
5. Ensure ./tools/format.js passes without changing files.
6. Ensure ./tools/lint.js passes. -->