preliminary support for yarn workspaces

package.json

@@ -70,6 +70,7 @@
     "@yarnpkg/lockfile": "^1.1.0",
     "chalk": "^2.4.2",
     "cross-spawn": "^6.0.5",
+    "find-yarn-workspace-root": "^1.2.1",
     "fs-extra": "^7.0.1",
     "is-ci": "^2.0.0",
     "klaw-sync": "^6.0.0",

src/detectPackageManager.ts

@@ -2,6 +2,7 @@ import fs from "fs-extra"
 import { join } from "./path"
 import chalk from "chalk"
 import process from "process"
+import findWorkspaceRoot from "find-yarn-workspace-root"
 
 export type PackageManager = "yarn" | "npm" | "npm-shrinkwrap"
 
@@ -61,7 +62,7 @@ export const detectPackageManager = (
     } else {
       return shrinkWrapExists ? "npm-shrinkwrap" : "npm"
     }
-  } else if (yarnLockExists) {
+  } else if (yarnLockExists || findWorkspaceRoot()) {
     return "yarn"
   } else {
     printNoLockfilesError()

src/getPackageResolution.ts

@@ -1,8 +1,9 @@
 import { join, resolve } from "./path"
 import { PackageDetails, getPatchDetailsFromCliString } from "./PackageDetails"
 import { PackageManager, detectPackageManager } from "./detectPackageManager"
-import { readFileSync } from "fs-extra"
+import { readFileSync, existsSync } from "fs-extra"
 import { parse as parseYarnLockFile } from "@yarnpkg/lockfile"
+import findWorkspaceRoot from "find-yarn-workspace-root"
 
 export function getPackageResolution({
   packageDetails,
@@ -14,7 +15,18 @@ export function getPackageResolution({
   appPath: string
 }) {
   if (packageManager === "yarn") {
-    const appLockFile = parseYarnLockFile(readFileSync("yarn.lock").toString())
+    let lockFilePath = "yarn.lock"
+    if (!existsSync(lockFilePath)) {
+      const workspaceRoot = findWorkspaceRoot()
+      if (!workspaceRoot) {
+        throw new Error("Can't find yarn.lock file")
+      }
+      lockFilePath = join(workspaceRoot, "yarn.lock")
+    }
+    if (!existsSync(lockFilePath)) {
+      throw new Error("Can't find yarn.lock file")
+    }
+    const appLockFile = parseYarnLockFile(readFileSync(lockFilePath).toString())
     if (appLockFile.type !== "success") {
       throw new Error("Can't parse lock file")
     }

yarn.lock

@@ -1580,6 +1580,14 @@ find-up@^3.0.0:
   dependencies:
     locate-path "^3.0.0"
 
+find-yarn-workspace-root@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/find-yarn-workspace-root/-/find-yarn-workspace-root-1.2.1.tgz#40eb8e6e7c2502ddfaa2577c176f221422f860db"
+  integrity sha512-dVtfb0WuQG+8Ag2uWkbG79hOUzEsRrhBzgfn86g2sJPkzmcpGdghbNTfUKGTxymFrY/tLIodDzLoW9nOJ4FY8Q==
+  dependencies:
+    fs-extra "^4.0.3"
+    micromatch "^3.1.4"
+
 fn-name@~2.0.1:
   version "2.0.1"
   resolved "https://registry.yarnpkg.com/fn-name/-/fn-name-2.0.1.tgz#5214d7537a4d06a4a301c0cc262feb84188002e7"
@@ -1609,6 +1617,15 @@ fragment-cache@^0.2.1:
   dependencies:
     map-cache "^0.2.2"
 
+fs-extra@^4.0.3:
+  version "4.0.3"
+  resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-4.0.3.tgz#0d852122e5bc5beb453fb028e9c0c9bf36340c94"
+  integrity sha512-q6rbdDd1o2mAnQreO7YADIxf/Whx4AHBiRf6d+/cVT8h44ss+lHgxf1FemcqDnQt9X3ct4McHr+JMGlYSsK7Cg==
+  dependencies:
+    graceful-fs "^4.1.2"
+    jsonfile "^4.0.0"
+    universalify "^0.1.0"
+
 fs-extra@^7.0.1:
   version "7.0.1"
   resolved "https://registry.yarnpkg.com/fs-extra/-/fs-extra-7.0.1.tgz#4f189c44aa123b895f722804f55ea23eadc348e9"