Source maps refer to invalid dependency paths

[justingrant]

Describe the bug
Sourcemaps for Amplify packages refer to invalid paths that existed at build time but don't exist when packages are installed from npm. This in turn breaks debugging in VSCode and other IDEs.

To Reproduce
Steps to reproduce the behavior:

1. npm i aws-amplify
2. open ./node_modules/aws-amplify/dist/aws-amplify.js.map
3. Excerpt the first few lines, adding line-breaks and indenting for clarity.

Expected behavior
According to https://github.com/Microsoft/vscode-chrome-debug#sourcemaps, for VSCode to resolve these paths, they should either be relative to the current folder or should be absolute project-relative paths (starting with webpack:///./node_modules/). Like this:

{
  "version":3,
  "sources":[
    "webpack:///webpack/universalModuleDefinition",
    "webpack:///aws-amplify.js",
    "webpack:///webpack/bootstrap 8a9f9b8798564350c1fc",
    "webpack:///./node_modules/aws-sdk/lib/core.js",
    "webpack:///./node_modules/@aws-amplify/core/lib/index.js",
    "webpack:///./node_modules/graphql/module/error/index.js",
    "webpack:///./node_modules/graphql/module/type/definition.js",
    "webpack:///./node_modules/graphql/module/language/kinds.js",
    "webpack:///./node_modules/aws-sdk/lib/util.js",
    "webpack:///./node_modules/@aws-amplify/core/lib/Logger/index.js",

Actual behavior
Paths cannot be resolved by VSCode debugger because they don't exist after install from npm.

{
  "version":3,
  "sources":[
    "webpack:///webpack/universalModuleDefinition",
    "webpack:///aws-amplify.js",
    "webpack:///webpack/bootstrap 8a9f9b8798564350c1fc",
    "webpack:////root/app/node_modules/aws-sdk/lib/core.js",
    "webpack:///../core/lib/index.js",
    "webpack:////root/app/node_modules/graphql/module/error/index.js",
    "webpack:////root/app/node_modules/graphql/module/type/definition.js",
    "webpack:////root/app/node_modules/graphql/module/language/kinds.js",
    "webpack:////root/app/node_modules/aws-sdk/lib/util.js",
    "webpack:///../core/lib/Logger/index.js",

I'm working on a PR to fix this.

[github-actions]

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