Merge pull request #75 from stephank/feat/yarn4

Yarn v4 support
2023-10-30 08:16:55 +01:00
parent 10d226f780 582a9adee1
commit 1782753efe
14 changed files with 2268 additions and 2766 deletions
@@ -11,6 +11,9 @@ jobs:
    runs-on: ubuntu-latest
    permissions:
      contents: write
+    strategy:
+      matrix:
+        yarn_version: [3, 4]
    env:
      NIX_PATH: nixpkgs=channel:nixpkgs-unstable
    steps:
@@ -22,24 +25,21 @@ jobs:
        with:
          node-version: 18.x

-      - name: Yarn cache
-        uses: actions/cache@v3
-        with:
-          path: .yarn/cache
-          key: yarn-${{ hashFiles('yarn.lock') }}
-          restore-keys: yarn-
+      - name: Enable corepack
+        run: corepack enable

      - name: Yarn install
-        run: yarn install --immutable
+        run: yarn

      - name: TypeScript
+        if: matrix.yarn_version == 4
        run: yarn check

      - name: Build
        run: yarn build

      - name: Update dist
-        if: github.repository_owner == 'stephank' && github.ref == 'refs/heads/main'
+        if: matrix.yarn_version == 4 && github.repository_owner == 'stephank' && github.ref == 'refs/heads/main'
        run: |
          if [[ "$(git status --porcelain)" != "" ]]; then
            git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
@@ -48,24 +48,20 @@ jobs:
            git push
          fi

+      - name: Set Yarn version
+        run: yarn set version ${{ matrix.yarn_version }}
+
      - name: Install plugin
        run: yarn plugin import ./dist/yarn-plugin-nixify.js

      - name: Test without Nix
-        run: yarn
+        run: yarn --no-immutable

      - name: Install Nix
        uses: cachix/install-nix-action@v23
        with:
          nix_path: nixpkgs=channel:nixos-unstable

-      - name: Setup Cachix
-        if: github.event_name == 'push' && github.repository_owner == 'stephank'
-        uses: cachix/cachix-action@v12
-        with:
-          name: stephank
-          signingKey: "${{ secrets.CACHIX_SIGNING_KEY }}"
-
      - name: Add bin
        run: |
          cat > hello.js << EOF
@@ -82,7 +78,10 @@ jobs:
        run: yarn --no-immutable

      - name: Test nix-build
-        run: nix-build
+        run: |
+          # This delete tests refetching a package with Nix.
+          nix-store --delete /nix/store/*--yarnpkg-core-npm-*
+          nix-build

      - name: Test bin
        run: ./result/bin/hello
@@ -1,6 +1,4 @@
-/.yarn/*
-!/.yarn/releases
-!/.yarn/plugins
+/.yarn
 /.pnp.*

 /dist/yarn-plugin-nixify.dev.js
@@ -1 +0,0 @@
-yarnPath: .yarn/releases/yarn-3.3.1.cjs
@@ -2,7 +2,7 @@

 **Upgrading the plugin? See [UPGRADING.md](./UPGRADING.md)**

-Generates a [Nix] expression to build a [Yarn] v3 project (not using
+Generates a [Nix] expression to build a [Yarn] v3 or v4 project (not using
 zero-install).

 - Provides a `yarn` shell alias in the Nix builder — no global Yarn v1 install
@@ -43,8 +43,8 @@ Related projects:

 ## Usage

-The minimum version of Yarn is 3.1.0. Run the following in your project folder
-to check:
+This plugin is compatible with Yarn >= 3.1.0 or >= 4.0.0. Run the following in
+your project folder to check:

 ```sh
 # Check your Yarn version
@@ -8,47 +8,24 @@
    "build-dev": "./build.js",
    "fmt": "prettier --write src"
  },
-  "packageManager": "yarn@3.3.1",
+  "packageManager": "yarn@4.0.1",
  "devDependencies": {
    "@babel/core": "^7.11.4",
    "@babel/plugin-proposal-class-properties": "^7.10.4",
    "@babel/plugin-proposal-decorators": "^7.10.5",
    "@babel/preset-typescript": "^7.10.4",
    "@types/node": "10",
-    "@yarnpkg/cli": "^3.0.0",
-    "@yarnpkg/core": "^3.0.0",
-    "@yarnpkg/fslib": "^2.5.1",
-    "@yarnpkg/plugin-patch": "^3.0.0",
-    "@yarnpkg/plugin-pnp": "^3.1.0",
-    "babel-loader": "^8.1.0",
-    "clipanion": "^3.0.0",
-    "prettier": "2.5.1",
+    "@yarnpkg/cli": "^4.0.0",
+    "@yarnpkg/core": "^4.0.0",
+    "@yarnpkg/fslib": "^3.0.0",
+    "@yarnpkg/plugin-patch": "^4.0.0",
+    "@yarnpkg/plugin-pnp": "^4.0.0",
+    "babel-loader": "^9.1.3",
+    "clipanion": "^4.0.0-rc.2",
+    "prettier": "3.0.3",
    "raw-loader": "^4.0.1",
-    "typescript": "4.5.4",
+    "typescript": "5.2.2",
    "webpack": "^5.35.0",
-    "webpack-sources": "^2.2.0"
-  },
-  "resolutions": {
-    "@yarnpkg/cli": "3.1.0",
-    "@yarnpkg/core": "3.1.0",
-    "@yarnpkg/fslib": "2.5.1",
-    "@yarnpkg/libzip": "2.2.2",
-    "@yarnpkg/plugin-compat": "3.0.0",
-    "@yarnpkg/plugin-dlx": "3.0.0",
-    "@yarnpkg/plugin-essentials": "3.0.0",
-    "@yarnpkg/plugin-file": "2.2.1",
-    "@yarnpkg/plugin-git": "2.4.0",
-    "@yarnpkg/plugin-github": "2.2.0",
-    "@yarnpkg/plugin-http": "2.1.3",
-    "@yarnpkg/plugin-init": "3.0.0",
-    "@yarnpkg/plugin-link": "2.1.2",
-    "@yarnpkg/plugin-node-modules": "2.3.0",
-    "@yarnpkg/plugin-npm": "2.5.0",
-    "@yarnpkg/plugin-npm-cli": "3.0.0",
-    "@yarnpkg/plugin-pack": "3.0.0",
-    "@yarnpkg/plugin-patch": "3.0.0",
-    "@yarnpkg/plugin-pnp": "3.1.0",
-    "@yarnpkg/plugin-stage": "3.0.0",
-    "@yarnpkg/shell": "3.0.0"
+    "webpack-sources": "^3.2.3"
  }
 }
@@ -18,7 +18,7 @@ export default class FetchOneCommand extends Command<CommandContext> {
  async execute() {
    const configuration = await Configuration.find(
      this.context.cwd,
-      this.context.plugins
+      this.context.plugins,
    );
    const { project } = await Project.find(configuration, this.context.cwd);
    const cache = await Cache.find(configuration);
@@ -42,7 +42,7 @@ export default class FetchOneCommand extends Command<CommandContext> {
          fetcher,
          report,
        });
-      }
+      },
    );

    return report.exitCode();
@@ -23,7 +23,7 @@ export default class InjectBuildCommand extends Command<CommandContext> {
  async execute() {
    const configuration = await Configuration.find(
      this.context.cwd,
-      this.context.plugins
+      this.context.plugins,
    );
    const { project } = await Project.find(configuration, this.context.cwd);

@@ -48,7 +48,7 @@ export default class InjectBuildCommand extends Command<CommandContext> {
        // the read-only permissions of our source path in the Nix store.
        const installLocation = ppath.join(
          project.cwd,
-          this.installLocation as PortablePath
+          this.installLocation as PortablePath,
        );
        await xfs.mkdirpPromise(ppath.dirname(installLocation));
        await execUtils.execvp("cp", ["-R", this.source, installLocation], {
@@ -72,7 +72,7 @@ export default class InjectBuildCommand extends Command<CommandContext> {
          (data: Buffer | string) => {
            globalHashGenerator.update(`\0`);
            globalHashGenerator.update(data);
-          }
+          },
        );

        const globalHash = globalHashGenerator.digest(`hex`);
@@ -86,7 +86,7 @@ export default class InjectBuildCommand extends Command<CommandContext> {
          const pkg = project.storedPackages.get(locator.locatorHash);
          if (typeof pkg === `undefined`)
            throw new Error(
-              `Assertion failed: The package should have been registered`
+              `Assertion failed: The package should have been registered`,
            );

          const builder = createHash(`sha512`);
@@ -97,20 +97,20 @@ export default class InjectBuildCommand extends Command<CommandContext> {

          for (const descriptor of pkg.dependencies.values()) {
            const resolution = project.storedResolutions.get(
-              descriptor.descriptorHash
+              descriptor.descriptorHash,
            );
            if (typeof resolution === `undefined`)
              throw new Error(
                `Assertion failed: The resolution (${structUtils.prettyDescriptor(
                  project.configuration,
-                  descriptor
-                )}) should have been registered`
+                  descriptor,
+                )}) should have been registered`,
              );

            const dependency = project.storedPackages.get(resolution);
            if (typeof dependency === `undefined`)
              throw new Error(
-                `Assertion failed: The package should have been registered`
+                `Assertion failed: The package should have been registered`,
              );

            builder.update(getBaseHash(dependency));
@@ -133,7 +133,7 @@ export default class InjectBuildCommand extends Command<CommandContext> {
        // `yarn install` later, which should clean it up again.
        project.storedBuildState.set(pkg.locatorHash, buildHash);
        await project.persistInstallStateFile();
-      }
+      },
    );

    return report.exitCode();
@@ -24,11 +24,11 @@ export default class InstallBinCommand extends Command<CommandContext> {
  async execute() {
    const configuration = await Configuration.find(
      this.context.cwd,
-      this.context.plugins
+      this.context.plugins,
    );
    const { project, workspace } = await Project.find(
      configuration,
-      this.context.cwd
+      this.context.cwd,
    );

    const report = await StreamReport.start(
@@ -44,7 +44,7 @@ export default class InstallBinCommand extends Command<CommandContext> {
          const wrapperPath = ppath.join(binDir, name as Filename);
          const binaryPath = ppath.join(
            project.cwd,
-            npath.toPortablePath(binaryFile)
+            npath.toPortablePath(binaryFile),
          );
          await this.writeWrapper(wrapperPath, binaryPath, {
            configuration,
@@ -56,18 +56,18 @@ export default class InstallBinCommand extends Command<CommandContext> {
          await project.resolveEverything({ report, lockfileOnly: true });
          const binaries = await scriptUtils.getPackageAccessibleBinaries(
            project.topLevelWorkspace.anchoredLocator,
-            { project }
+            { project },
          );
          for (const [name, [_, binaryPath]] of binaries.entries()) {
            const wrapperPath = ppath.join(binDir, name as Filename);
            await this.writeWrapper(
              wrapperPath,
              npath.toPortablePath(binaryPath),
-              { configuration, project }
+              { configuration, project },
            );
          }
        }
-      }
+      },
    );

    return report.exitCode();
@@ -79,7 +79,7 @@ export default class InstallBinCommand extends Command<CommandContext> {
    {
      configuration,
      project,
-    }: { configuration: Configuration; project: Project }
+    }: { configuration: Configuration; project: Project },
  ) {
    let wrapper;
    switch (configuration.get(`nodeLinker`)) {
@@ -88,14 +88,14 @@ export default class InstallBinCommand extends Command<CommandContext> {
        const nodeOptions = [];
        if (await xfs.existsPromise(pnpPath.cjs)) {
          nodeOptions.push(
-            `--require "${npath.fromPortablePath(pnpPath.cjs)}"`
+            `--require "${npath.fromPortablePath(pnpPath.cjs)}"`,
          );
        }
        if (await xfs.existsPromise(pnpPath.esmLoader)) {
          nodeOptions.push(
            `--experimental-loader "${
              pathToFileURL(npath.fromPortablePath(pnpPath.esmLoader)).href
-            }"`
+            }"`,
          );
        }
        wrapper = renderTmpl(binWrapperPnpTmpl, {
@@ -1,13 +1,11 @@
+import { tmpdir } from "os";
+
 import { Filename, npath, PortablePath, ppath, xfs } from "@yarnpkg/fslib";
 import { patchUtils } from "@yarnpkg/plugin-patch";
-import {
-  computeFixedOutputStorePath,
-  sanitizeDerivationName,
-} from "./nixUtils";
 import { json, indent, renderTmpl, upperCamelize } from "./textUtils";
-
 import {
  Cache,
+  YarnVersion,
  execUtils,
  hashUtils,
  InstallMode,
@@ -20,12 +18,17 @@ import {

 import defaultExprTmpl from "./tmpl/default.nix.in";
 import projectExprTmpl from "./tmpl/yarn-project.nix.in";
-import { tmpdir } from "os";
+import {
+  computeFixedOutputStorePath,
+  sanitizeDerivationName,
+} from "./nixUtils";
+
+const isYarn3 = YarnVersion?.startsWith("3.") || false;

 // Generator function that runs after `yarn install`.
 export default async (
  project: Project,
-  opts: { cache: Cache; report: Report; mode?: InstallMode }
+  opts: { cache: Cache; report: Report; mode?: InstallMode },
 ) => {
  const { configuration, cwd } = project;
  const { cache, report } = opts;
@@ -40,7 +43,7 @@ export default async (
  if (project.cwd.startsWith(tempDir)) {
    report.reportInfo(
      0,
-      `Skipping Nixify, because ${project.cwd} appears to be a temporary directory`
+      `Skipping Nixify, because ${project.cwd} appears to be a temporary directory`,
    );
    return;
  }
@@ -49,15 +52,27 @@ export default async (
  const nixExprPath = configuration.get(`nixExprPath`);

  const yarnPathAbs = configuration.get(`yarnPath`);
-  let yarnPathExpr: string;
-  if (yarnPathAbs.startsWith(cwd)) {
-    yarnPathExpr =
+  let yarnBinExpr: string;
+  if (yarnPathAbs === null) {
+    // Assume the current running script is the correct Yarn.
+    const hexHash = await hashUtils.checksumFile(
+      process.argv[1] as PortablePath,
+    );
+    const sriHash = "sha512-" + Buffer.from(hexHash, "hex").toString("base64");
+    yarnBinExpr = [
+      "fetchurl {",
+      `  url = "https://repo.yarnpkg.com/${YarnVersion!}/packages/yarnpkg-cli/bin/yarn.js";`,
+      `  hash = "${sriHash}";`,
+      "}",
+    ].join("\n  ");
+  } else if (yarnPathAbs.startsWith(cwd)) {
+    yarnBinExpr =
      "./" + ppath.relative(ppath.dirname(nixExprPath), yarnPathAbs);
  } else {
-    yarnPathExpr = json(yarnPathAbs);
+    yarnBinExpr = json(yarnPathAbs);
    report.reportWarning(
      0,
-      `The Yarn path ${yarnPathAbs} is outside the project - it may not be reachable by the Nix build`
+      `The Yarn path ${yarnPathAbs} is outside the project - it may not be reachable by the Nix build`,
    );
  }

@@ -65,9 +80,11 @@ export default async (
  let cacheFolderExpr: string;
  if (cacheFolderAbs.startsWith(cwd)) {
    cacheFolderExpr = json(ppath.relative(cwd, cacheFolderAbs));
+  } else if (!isYarn3 && configuration.get(`enableGlobalCache`)) {
+    cacheFolderExpr = '".yarn/cache"';
  } else {
    throw Error(
-      `The cache folder ${cacheFolderAbs} is outside the project, this is currently not supported`
+      `The cache folder ${cacheFolderAbs} is outside the project, this is currently not supported`,
    );
  }

@@ -84,7 +101,7 @@ export default async (
    if (!relativeSource.startsWith(cwd)) {
      report.reportWarning(
        0,
-        `The config file ${source} is outside the project - it may not be reachable by the Nix build`
+        `The config file ${source} is outside the project - it may not be reachable by the Nix build`,
      );
    }
  }
@@ -93,12 +110,13 @@ export default async (
    "./" +
    ppath.relative(
      ppath.dirname(nixExprPath),
-      ppath.resolve(cwd, 'yarn.lock' as PortablePath)
+      ppath.resolve(cwd, "yarn.lock" as PortablePath),
    );

  // Build a list of cache entries so Nix can fetch them.
  // TODO: See if we can use Nix fetchurl for npm: dependencies.
  interface CacheEntry {
+    originalFilename: Filename;
    filename: Filename;
    sha512: string;
  }
@@ -109,7 +127,9 @@ export default async (
  for (const pkg of project.storedPackages.values()) {
    const { locatorHash } = pkg;
    const checksum = project.storedChecksums.get(locatorHash);
-    const cachePath = cache.getLocatorPath(pkg, checksum || null, cacheOptions);
+    const cachePath = isYarn3
+      ? (cache as any).getLocatorPath(pkg, checksum || null, cacheOptions)
+      : cache.getLocatorPath(pkg, checksum || null);
    if (!cachePath) continue;

    const filename = ppath.basename(cachePath);
@@ -119,7 +139,13 @@ export default async (
    const sha512 = checksum
      ? checksum.split(`/`).pop()!
      : await hashUtils.checksumFile(cachePath);
-    cacheEntries.set(locatorStr, { filename, sha512 });
+    cacheEntries.set(locatorStr, {
+      originalFilename: filename,
+      // Rebuild the filename, because the cache file we're operating on may be
+      // from the mirror directory, which uses different naming.
+      filename: cache.getChecksumFilename(pkg, sha512),
+      sha512,
+    });
  }

  let cacheEntriesCode = `cacheEntries = {\n`;
@@ -149,11 +175,11 @@ export default async (

    if (structUtils.isVirtualLocator(pkg)) {
      const devirtPkg = project.storedPackages.get(
-        structUtils.devirtualizeLocator(pkg).locatorHash
+        structUtils.devirtualizeLocator(pkg).locatorHash,
      );
      if (!devirtPkg) {
        throw Error(
-          `Assertion failed: The locator should have been registered`
+          `Assertion failed: The locator should have been registered`,
        );
      }

@@ -162,11 +188,11 @@ export default async (

    if (pkg.reference.startsWith("patch:")) {
      const depatchPkg = project.storedPackages.get(
-        patchUtils.parseLocator(pkg).sourceLocator.locatorHash
+        patchUtils.parseLocator(pkg).sourceLocator.locatorHash,
      );
      if (!depatchPkg) {
        throw Error(
-          `Assertion failed: The locator should have been registered`
+          `Assertion failed: The locator should have been registered`,
        );
      }

@@ -175,18 +201,18 @@ export default async (

    for (const dependency of pkg.dependencies.values()) {
      const resolution = project.storedResolutions.get(
-        dependency.descriptorHash
+        dependency.descriptorHash,
      );
      if (!resolution) {
        throw Error(
-          "Assertion failed: The descriptor should have been registered"
+          "Assertion failed: The descriptor should have been registered",
        );
      }

      const depPkg = project.storedPackages.get(resolution);
      if (!depPkg) {
        throw Error(
-          `Assertion failed: The locator should have been registered`
+          `Assertion failed: The locator should have been registered`,
        );
      }

@@ -217,13 +243,13 @@ export default async (
          ppath.join(
            pnpUnpluggedFolder,
            structUtils.slugifyLocator(pkg),
-            structUtils.getIdentVendorPath(pkg)
-          )
+            structUtils.getIdentVendorPath(pkg),
+          ),
        );
        break;
      default:
        throw Error(
-          `The nodeLinker ${nodeLinker} is not supported for isolated Nix builds`
+          `The nodeLinker ${nodeLinker} is not supported for isolated Nix builds`,
        );
    }

@@ -236,7 +262,7 @@ export default async (
      const pkg = project.storedPackages.get(locatorHash);
      if (!pkg) {
        throw Error(
-          `Assertion failed: The locator should have been registered`
+          `Assertion failed: The locator should have been registered`,
        );
      }
      devirtPkg = pkg;
@@ -261,7 +287,7 @@ export default async (
          `version = ${json(pkg.version)};`,
          `reference = ${json(devirtPkg.reference)};`,
          `locators = [\n${locators}];`,
-        ].join(` `)} });`
+        ].join(` `)} });`,
      );
    }

@@ -273,7 +299,7 @@ export default async (
      `yarn nixify inject-build \\`,
      `  ${json(injectLocatorStr)} \\`,
      `  $\{${isolatedProp}} \\`,
-      `  ${json(installLocation)}`
+      `  ${json(installLocation)}`,
    );
  }
  if (isolatedIntegration.length > 0) {
@@ -290,7 +316,7 @@ export default async (
    const projectName = ident ? structUtils.stringifyIdent(ident) : `workspace`;
    const projectExpr = renderTmpl(projectExprTmpl, {
      PROJECT_NAME: json(projectName),
-      YARN_PATH: yarnPathExpr,
+      YARN_BIN: yarnBinExpr,
      LOCKFILE: lockfileExpr,
      CACHE_FOLDER: cacheFolderExpr,
      CACHE_ENTRIES: cacheEntriesCode,
@@ -308,7 +334,7 @@ export default async (
        await xfs.writeFilePromise(defaultExprPath, defaultExprTmpl);
        report.reportInfo(
          0,
-          `A minimal default.nix was created. You may want to customize it.`
+          `A minimal default.nix was created. You may want to customize it.`,
        );
      }
    }
@@ -321,7 +347,10 @@ export default async (
  ) {
    await xfs.mktempPromise(async (tempDir) => {
      const toPreload: PortablePath[] = [];
-      for (const [locator, { filename, sha512 }] of cacheEntries.entries()) {
+      for (const [
+        locator,
+        { originalFilename, sha512 },
+      ] of cacheEntries.entries()) {
        const name = sanitizeDerivationName(locator);
        // Check to see if the Nix store entry already exists.
        const hash = Buffer.from(sha512, "hex");
@@ -336,7 +365,7 @@ export default async (
          const subdir = ppath.join(tempDir, sha512.slice(0, 7) as Filename);
          await xfs.mkdirPromise(subdir);

-          const src = ppath.join(cache.cwd, filename);
+          const src = ppath.join(cache.cwd, originalFilename);
          const dst = ppath.join(subdir, name as Filename);
          await xfs.copyFilePromise(src, dst);

@@ -355,13 +384,13 @@ export default async (
            {
              cwd: project.cwd,
              strict: true,
-            }
+            },
          );
        }
        if (numToPreload !== 0) {
          report.reportInfo(
            0,
-            `Preloaded ${numToPreload} packages into the Nix store`
+            `Preloaded ${numToPreload} packages into the Nix store`,
          );
        }
      } catch (err: any) {
@@ -46,7 +46,7 @@ export const computeFixedOutputStorePath = (
  name: string,
  hashAlgorithm: string,
  hash: Buffer,
-  storePath = `/nix/store` as PortablePath
+  storePath = `/nix/store` as PortablePath,
 ) => {
  const hashHex = hash.toString("hex");

@@ -24,7 +24,7 @@ export const upperCamelize = (name: string) =>
 export const indent = (
  prefix: string,
  text: string,
-  includeEmptyLines = false
+  includeEmptyLines = false,
 ): string =>
  text
    .split("\n")
@@ -41,7 +41,7 @@ export const indent = (
 */
 export const renderTmpl = (
  tmpl: string,
-  vars: { [name: string]: string | boolean }
+  vars: { [name: string]: string | boolean },
 ): string => {
  let result = tmpl;
  for (const [name, value] of Object.entries(vars)) {
@@ -6,6 +6,8 @@

 let

+  yarnBin = @@YARN_BIN@@;
+
  cacheFolder = @@CACHE_FOLDER@@;
  lockfile = @@LOCKFILE@@;

@@ -15,7 +17,7 @@ let

  # Simple stub that provides the global yarn command.
  yarn = writeShellScriptBin "yarn" ''
-    exec '${nodejs}/bin/node' '${@@YARN_PATH@@}' "$@"
+    exec '${nodejs}/bin/node' '${yarnBin}' "$@"
  '';

  # Common attributes between Yarn derivations.
@@ -42,7 +44,7 @@ let
      source $stdenv/setup
      cd "$src"
      ${buildVars}
-      HOME="$TMP" yarn_cache_folder="$TMP" \
+      HOME="$TMP" yarn_enable_global_cache=false yarn_cache_folder="$TMP" \
        yarn nixify fetch-one $locator
      # Because we change the cache dir, Yarn may generate a different name.
      mv "$TMP/$(sed 's/-[^-]*\.[^-]*$//' <<< "$outputFilename")"-* $out
@@ -89,7 +91,8 @@ let
      echo '{ "dependencies": { "${pname}": "${reference}" } }' > package.json
      install -m 0600 ${lockfile} ./yarn.lock
      export yarn_global_folder="$TMP"
-      export YARN_ENABLE_IMMUTABLE_INSTALLS=false
+      export yarn_enable_global_cache=false
+      export yarn_enable_immutable_installs=false
      yarn --immutable-cache
    '';

@@ -123,6 +126,11 @@ let
      # Yarn may need a writable home directory.
      export yarn_global_folder="$TMP"

+      # Ensure global cache is disabled. Cache must be part of our output.
+      touch .yarnrc.yml
+      sed -i -e '/^enableGlobalCache/d' .yarnrc.yml
+      echo 'enableGlobalCache: false' >> .yarnrc.yml
+
      # Some node-gyp calls may call out to npm, which could fail due to an
      # read-only home dir.
      export HOME="$TMP"