Initial commit

.gitignore

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+dist/
+node_modules
+.nyc_output
+.idea

.nycrc.json

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+{
+  "check-coverage": true,
+  "branches": 100,
+  "lines": 100,
+  "functions": 100,
+  "statements": 100
+}

LICENSE

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+MIT License
+
+Copyright (c) 2021 Joshua Jacobowitz
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

fixtures/bolt/package.json

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+{
+  "name": "bolt",
+  "private": true,
+  "bolt": {
+    "workspaces": [
+      "packages/*"
+    ]
+  }
+}

fixtures/bolt/packages/a/package.json

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+{
+  "name": "@bolt/a",
+  "private": true
+}

fixtures/bolt/packages/b/package.json

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+{
+  "name": "@bolt/b",
+  "private": true
+}

fixtures/lerna-with-defaults/lerna.json

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+{}

fixtures/lerna-with-defaults/package.json

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+{
+  "name": "lerna-with-defaults",
+  "private": true
+}

fixtures/lerna-with-defaults/packages/a/package.json

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+{
+  "name": "@lerna-with-defaults/a",
+  "private": true
+}

fixtures/lerna-with-defaults/packages/b/package.json

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+{
+  "name": "@lerna-with-defaults/b",
+  "private": true
+}

fixtures/lerna-with-invalid-packages/lerna.json

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+{ "packages": [1] }

fixtures/lerna-with-invalid-packages/package.json

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+{
+  "name": "lerna-with-invalid-packages",
+  "private": true
+}

fixtures/lerna-with-invalid-packages/packages/a/package.json

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+{
+  "name": "@lerna-with-invalid-packages/a",
+  "private": true
+}

fixtures/lerna-with-invalid-packages/packages/b/package.json

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+{
+  "name": "@lerna-with-invalid-packages/b",
+  "private": true
+}

fixtures/lerna-with-invalid-workspaces/lerna.json

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+{ "useWorkspaces": true }

fixtures/lerna-with-invalid-workspaces/package.json

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+{
+  "name": "lerna-with-invalid-workspaces",
+  "private": true
+}

fixtures/lerna-with-invalid-workspaces/packages/a/package.json

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+{
+  "name": "@lerna-with-invalid-workspaces/a",
+  "private": true
+}

fixtures/lerna-with-invalid-workspaces/packages/b/package.json

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+{
+  "name": "@lerna-with-invalid-workspaces/b",
+  "private": true
+}

fixtures/lerna/lerna.json

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+{ "packages": ["packages/*"] }

fixtures/lerna/package.json

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+{
+  "name": "lerna",
+  "private": true
+}

fixtures/lerna/packages/a/package.json

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+{
+  "name": "@lerna/a",
+  "private": true
+}

fixtures/lerna/packages/b/package.json

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+{
+  "name": "@lerna/b",
+  "private": true
+}

fixtures/yarn-npm-with-packages/package.json

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+{
+  "name": "yarn-npm-with-packages",
+  "private": true,
+  "workspaces": {
+    "packages": [
+      "packages/*"
+    ]
+  }
+}

fixtures/yarn-npm-with-packages/packages/a/package.json

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+{
+  "name": "@yarn-npm-with-packages/a",
+  "private": true
+}

fixtures/yarn-npm-with-packages/packages/b/package.json

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+{
+  "name": "@yarn-npm-with-packages/b",
+  "private": true
+}

fixtures/yarn-npm/package.json

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+{
+  "name": "yarn-npm",
+  "private": true,
+  "workspaces": [
+    "packages/*"
+  ]
+}

fixtures/yarn-npm/packages/a/package.json

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+{
+  "name": "@yarn-npm/a",
+  "private": true
+}

fixtures/yarn-npm/packages/b/package.json

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+{
+  "name": "@yarn-npm/b",
+  "private": true
+}

index.ts

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+import { resolve } from "path";
+import globby from "globby";
+
+export type WorkspacesRoot = { location: string; globs: string[] };
+export type Workspace = { location: string; package: any };
+
+type Cache = {
+  root: { [dir: string]: WorkspacesRoot | null | undefined };
+  workspaces: { [dir: string]: Workspace[] | undefined };
+};
+
+const cache: Cache = { root: {}, workspaces: {} };
+
+export function findRoot(dirname?: string) {
+  const dir = dirname ? resolve(dirname) : process.cwd();
+  return findWorkspacesRoot(dir);
+}
+
+findRoot.clearCache = () => {
+  cache.root = {};
+};
+
+export function findWorkspaces(dirname?: string): Workspace[] | null {
+  const root = findRoot(dirname);
+
+  if (!root) return null;
+
+  const cached = cache.workspaces[root.location];
+
+  if (cached) return cached;
+
+  const workspaces = globby
+    .sync(root.globs, {
+      cwd: root.location,
+      onlyDirectories: true,
+      absolute: true,
+      ignore: ["**/node_modules/**"],
+    })
+    .map((location) => {
+      const resolved = resolve(location);
+      return {
+        location: resolved,
+        package: resolveJSONFile(resolved, "package.json"),
+      };
+    })
+    .filter((v): v is Workspace => !!v.package);
+
+  cache.workspaces[root.location] = workspaces;
+
+  return workspaces;
+}
+
+findWorkspaces.clearCache = () => {
+  findRoot.clearCache();
+  cache.workspaces = {};
+};
+
+function findWorkspacesRoot(
+  dir: string,
+  dirs: string[] = [dir]
+): WorkspacesRoot | null {
+  const cached = cache.root[dir];
+
+  const save = (value: WorkspacesRoot | null) => {
+    dirs.forEach((d) => (cache.root[d] = value));
+    return value;
+  };
+
+  if (cached === null) return save(null);
+
+  if (cached) return save(cached);
+
+  const globs = findWorkspaceGlobs(dir);
+
+  if (globs) return save({ location: dir, globs });
+
+  const next = resolve(dir, "..");
+
+  if (next === dir) return save(null);
+
+  return findWorkspacesRoot(next, [next, ...dirs]);
+}
+
+function findWorkspaceGlobs(dir: string): string[] | null {
+  const packageJson = resolveJSONFile(dir, "package.json");
+
+  if (packageJson) {
+    if (isStringArray(packageJson.workspaces)) return packageJson.workspaces;
+
+    if (isStringArray(packageJson.workspaces?.packages)) {
+      return packageJson.workspaces.packages;
+    }
+
+    if (isStringArray(packageJson.bolt?.workspaces)) {
+      return packageJson.bolt.workspaces;
+    }
+  }
+
+  const lernaJson = resolveJSONFile(dir, "lerna.json");
+
+  if (lernaJson) {
+    if (lernaJson.useWorkspaces === true) return null;
+    if (!lernaJson.packages) return ["packages/*"];
+    if (isStringArray(lernaJson.packages)) return lernaJson.packages;
+  }
+
+  return null;
+}
+
+function resolveJSONFile(dir: string, file: string) {
+  const filePath = resolve(dir, file);
+  try {
+    return require(filePath);
+  } catch {
+    return null;
+  }
+}
+
+function isStringArray(value: unknown): value is string[] {
+  if (!Array.isArray(value)) return false;
+  return value.every((item) => typeof item === "string");
+}