Support referencing files in a specific package or at the workspace level in inputs

change/change-e975674f-161c-4841-9fec-9751de3638dd.json

@@ -0,0 +1,11 @@
+{
+  "changes": [
+    {
+      "type": "minor",
+      "comment": "Support referencing files in a specific package or at the workspace level in inputs",
+      "packageName": "@lage-run/hasher",
+      "email": "dobes@formative.com",
+      "dependentChangeType": "patch"
+    }
+  ]
+}

packages/hasher/src/PackageTree.ts

@@ -110,7 +110,11 @@ export class PackageTree {
 
   getPackageFiles(packageName: string, patterns: string[]) {
     const { root, packageInfos } = this.options;
-    const packagePath = path.relative(root, path.dirname(packageInfos[packageName].packageJsonPath)).replace(/\\/g, "/");
+    // Look up the directory of the specified package.  If packageName is "", that means they want to find a file
+    // relative to the root workspace.
+    const packagePath = packageName
+      ? path.relative(root, path.dirname(packageInfos[packageName].packageJsonPath)).replace(/\\/g, "/")
+      : "";
 
     const packageFiles = this.#packageFiles[packagePath];
 

packages/hasher/src/__tests__/TargetHasher.test.ts

@@ -126,6 +126,52 @@ describe("The main Hasher class", () => {
     monorepo2.cleanup();
   });
 
+  it("creates different hashes when a src file has changed for a specific package", async () => {
+    const monorepo1 = await setupFixture("monorepo");
+    const hasher = new TargetHasher({ root: monorepo1.root, environmentGlob: [] });
+    const target = createTarget(monorepo1.root, "package-a", "build");
+    target.inputs = ["**/*", "package-b#src/index.ts"];
+
+    const hash = await getHash(hasher, target);
+
+    const monorepo2 = await setupFixture("monorepo");
+    await monorepo2.commitFiles({ "packages/package-b/src/index.ts": "console.log('hello world');" });
+
+    const hasher2 = new TargetHasher({ root: monorepo2.root, environmentGlob: [] });
+    const target2 = createTarget(monorepo2.root, "package-a", "build");
+    target2.inputs = ["**/*", "package-b#src/index.ts"];
+
+    const hash2 = await getHash(hasher2, target2);
+
+    expect(hash).not.toEqual(hash2);
+
+    monorepo1.cleanup();
+    monorepo2.cleanup();
+  });
+
+  it("creates different hashes when a src file has changed in the root package", async () => {
+    const monorepo1 = await setupFixture("monorepo");
+    const hasher = new TargetHasher({ root: monorepo1.root, environmentGlob: [] });
+    const target = createTarget(monorepo1.root, "package-a", "build");
+    target.inputs = ["**/*", "#config.txt"];
+
+    const hash = await getHash(hasher, target);
+
+    const monorepo2 = await setupFixture("monorepo");
+    await monorepo2.commitFiles({ "config.txt": "hello" });
+
+    const hasher2 = new TargetHasher({ root: monorepo2.root, environmentGlob: [] });
+    const target2 = createTarget(monorepo2.root, "package-a", "build");
+    target2.inputs = ["**/*", "#config.txt"];
+
+    const hash2 = await getHash(hasher2, target2);
+
+    expect(hash).not.toEqual(hash2);
+
+    monorepo1.cleanup();
+    monorepo2.cleanup();
+  });
+
   it("creates different hashes when the target has a different env glob", async () => {
     const monorepo1 = await setupFixture("monorepo-with-global-files");
     const hasher = new TargetHasher({ root: monorepo1.root, environmentGlob: [] });

packages/hasher/src/expandInputPatterns.ts

@@ -1,7 +1,7 @@
 import { type Target } from "@lage-run/target-graph";
 import { type DependencyMap } from "workspace-tools";
 
-export function expandInputPatterns(patterns: string[], target: Target, dependencyMap: DependencyMap) {
+export function expandInputPatterns(patterns: string[], target: Target, dependencyMap: DependencyMap): Record<string, string[]> {
   const expandedPatterns: Record<string, string[]> = {};
 
   for (const pattern of patterns) {
@@ -34,6 +34,13 @@ export function expandInputPatterns(patterns: string[], target: Target, dependen
           }
         }
       }
+    } else if (pattern.includes("#")) {
+      // In this case they specified a specific package which an input file will be pulled from
+      // Note that if the path starts with '#' the pkg is caluclated as "" and the file is resolved
+      // relative to the root workspace
+      const [pkg, matchPattern] = pattern.split("#");
+      expandedPatterns[pkg] = expandedPatterns[pkg] ?? [];
+      expandedPatterns[pkg].push(matchPattern);
     } else {
       const pkg = target.packageName!;
       expandedPatterns[pkg] = expandedPatterns[pkg] ?? [];