fix: remove usage of lodash flatten (lerna#4205)

Author: JamesHenry

libs/core/src/lib/add-dependents.ts

@@ -1,20 +1,19 @@
-import { flatten } from "lodash";
 import { ProjectGraphProjectNodeWithPackage, ProjectGraphWithPackages } from "./project-graph-with-packages";
 
 export function addDependents(
   projects: ProjectGraphProjectNodeWithPackage[],
   projectGraph: ProjectGraphWithPackages
 ): ProjectGraphProjectNodeWithPackage[] {
   const projectsLookup = new Set(projects.map((p) => p.name));
-  const dependents: Record<string, string[]> = flatten(
-    Object.values(projectGraph.localPackageDependencies)
-  ).reduce(
-    (prev, next) => ({
-      ...prev,
-      [next.target]: [...(prev[next.target] || []), next.source],
-    }),
-    {} as Record<string, string[]>
-  );
+  const dependents: Record<string, string[]> = Object.values(projectGraph.localPackageDependencies)
+    .flat()
+    .reduce(
+      (prev, next) => ({
+        ...prev,
+        [next.target]: [...(prev[next.target] || []), next.source],
+      }),
+      {} as Record<string, string[]>
+    );
 
   const collected = new Set<ProjectGraphProjectNodeWithPackage>();
 

libs/core/src/lib/collect-updates/collect-project-updates.ts

@@ -1,5 +1,4 @@
 import { ExecOptions } from "child_process";
-import { flatten } from "lodash";
 import { describeRefSync } from "../describe-ref";
 import { getPackagesForOption } from "../get-packages-for-option";
 import log from "../npmlog";
@@ -178,15 +177,15 @@ export function collectDependents(
   nodes: Record<string, ProjectGraphProjectNodeWithPackage>,
   projectGraph: ProjectGraphWithPackages
 ): Set<ProjectGraphProjectNodeWithPackage> {
-  const dependents: Record<string, string[]> = flatten(
-    Object.values(projectGraph.localPackageDependencies)
-  ).reduce(
-    (prev, next) => ({
-      ...prev,
-      [next.target]: [...(prev[next.target] || []), next.source],
-    }),
-    {} as Record<string, string[]>
-  );
+  const dependents: Record<string, string[]> = Object.values(projectGraph.localPackageDependencies)
+    .flat()
+    .reduce(
+      (prev, next) => ({
+        ...prev,
+        [next.target]: [...(prev[next.target] || []), next.source],
+      }),
+      {} as Record<string, string[]>
+    );
 
   const collected = new Set<ProjectGraphProjectNodeWithPackage>();
 

libs/core/src/lib/run-projects-topologically.ts

@@ -1,4 +1,3 @@
-import { flatten } from "lodash";
 import PQueue from "p-queue";
 import { getCycles, mergeOverlappingCycles, reportCycles } from "./cycles";
 import { ProjectGraphProjectNodeWithPackage, ProjectGraphWithPackages } from "./project-graph-with-packages";
@@ -24,7 +23,7 @@ export async function runProjectsTopologically<T>(
 
   const projectsMap = new Map(projects.map((p) => [p.name, p]));
   const localDependencies = projectGraph.localPackageDependencies;
-  const flattenedLocalDependencies = flatten(Object.values(localDependencies));
+  const flattenedLocalDependencies = Object.values(localDependencies).flat();
 
   const getProject = (name: string) => {
     const project = projectsMap.get(name);

libs/core/src/lib/toposort-projects.ts

@@ -1,4 +1,3 @@
-import { flatten } from "lodash";
 import { getCycles, mergeOverlappingCycles, reportCycles } from "./cycles";
 import { ProjectGraphProjectNodeWithPackage, ProjectGraphWithPackages } from "./project-graph-with-packages";
 
@@ -9,7 +8,7 @@ export function toposortProjects(
 ): ProjectGraphProjectNodeWithPackage[] {
   const projectsMap = new Map(projects.map((p) => [p.name, p]));
   const localDependencies = projectGraph.localPackageDependencies;
-  const flattenedLocalDependencies = flatten(Object.values(localDependencies));
+  const flattenedLocalDependencies = Object.values(localDependencies).flat();
 
   const getProject = (name: string) => {
     const project = projectsMap.get(name);