chore(lambda-nodejs): always use globally installed esbuild in Docker (…

…#12070)

Bundling sets the working directory to `cdk.AssetStaging.BUNDLING_INPUT_DIR`
but we want to force `npx` to always use the globally installed
`esbuild` and not a version available in the mounted volume.

Closes #12007


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*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

packages/@aws-cdk/aws-lambda-nodejs/lib/bundling.ts

@@ -51,6 +51,7 @@ export class Bundling implements cdk.BundlingOptions {
   public readonly image: cdk.BundlingDockerImage;
   public readonly command: string[];
   public readonly environment?: { [key: string]: string };
+  public readonly workingDirectory: string;
   public readonly local?: cdk.ILocalBundling;
 
   private readonly relativeEntryPath: string;
@@ -89,6 +90,9 @@ export class Bundling implements cdk.BundlingOptions {
     const bundlingCommand = this.createBundlingCommand(cdk.AssetStaging.BUNDLING_INPUT_DIR, cdk.AssetStaging.BUNDLING_OUTPUT_DIR);
     this.command = ['bash', '-c', bundlingCommand];
     this.environment = props.environment;
+    // Bundling sets the working directory to cdk.AssetStaging.BUNDLING_INPUT_DIR
+    // and we want to force npx to use the globally installed esbuild.
+    this.workingDirectory = '/';
 
     // Local bundling
     if (!props.forceDockerBundling) { // only if Docker is not forced

packages/@aws-cdk/aws-lambda-nodejs/test/bundling.test.ts

@@ -55,6 +55,7 @@ test('esbuild bundling in Docker', () => {
         'bash', '-c',
         'npx esbuild --bundle /asset-input/lib/handler.ts --target=node12 --platform=node --outfile=/asset-output/index.js --external:aws-sdk --loader:.png=dataurl',
       ],
+      workingDirectory: '/',
     }),
   });
 });