ng-annotate-webpack-plugin: Error: StringMap expected string key

[pallakartheekreddy]

My Webpack Config file having below code:

const ngAnnotatePlugin = require('ng-annotate-webpack-plugin');

plugins: [
.......
new ngAnnotatePlugin({
                add: true,
            }),
.....]

ERROR: throw new Error("StringMap expected string key");
Error: StringMap expected string key at stringmap.set

When we remove ng-annotate-webpack-plugin we are not getting above error.

[jeffling]

Can we see the full stack trace?

[stevenvachon]

Perhaps mine will help:

/project/node_modules/stringmap/stringmap.js:99
            throw new Error("StringMap expected string key");
            ^

Error: StringMap expected string key
    at stringmap.set (/project/node_modules/stringmap/stringmap.js:99:19)
    at Scope.add (/project/node_modules/ng-annotate-webpack-plugin/node_modules/ng-annotate/build/es5/scope.js:102:17)
    at /project/node_modules/ng-annotate-webpack-plugin/node_modules/ng-annotate/build/es5/scopetools.js:65:25
    at Array.forEach (<anonymous>)
    at createScopes (/project/node_modules/ng-annotate-webpack-plugin/node_modules/ng-annotate/build/es5/scopetools.js:64:21)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:25:19)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:43:25)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:46:21)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:43:25)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:46:21)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:43:25)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:46:21)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:46:21)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:43:25)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:43:25)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:43:25)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:46:21)
    at visit (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:43:25)
    at traverse (/project/node_modules/ordered-ast-traverse/ordered-ast-traverse.js:56:5)
    at Object.setupScopeAndReferences (/project/node_modules/ng-annotate-webpack-plugin/node_modules/ng-annotate/build/es5/scopetools.js:18:5)
    at ngAnnotate (/project/node_modules/ng-annotate-webpack-plugin/node_modules/ng-annotate/build/es5/ng-annotate-main.js:1123:16)
    at annotateFile (/project/node_modules/ng-annotate-webpack-plugin/index.js:27:29)
    at Array.forEach (<anonymous>)
    at /project/node_modules/ng-annotate-webpack-plugin/index.js:53:19
    at AsyncSeriesHook.eval [as callAsync] (eval at create (/project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:31:1)
    at AsyncSeriesHook.lazyCompileHook (/project/node_modules/tapable/lib/Hook.js:154:20)
    at /project/node_modules/webpack/lib/Compilation.js:1311:36
    at AsyncSeriesHook.eval [as callAsync] (eval at create (/project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:6:1)
    at AsyncSeriesHook.lazyCompileHook (/project/node_modules/tapable/lib/Hook.js:154:20)
    at /project/node_modules/webpack/lib/Compilation.js:1307:32
    at AsyncSeriesHook.eval [as callAsync] (eval at create (/project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:6:1)
    at AsyncSeriesHook.lazyCompileHook (/project/node_modules/tapable/lib/Hook.js:154:20)
    at Compilation.seal (/project/node_modules/webpack/lib/Compilation.js:1244:27)
    at /project/node_modules/webpack/lib/Compiler.js:624:17
    at _done (eval at create (/project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:9:1)
    at eval (eval at create (/project/node_modules/tapable/lib/HookCodeFactory.js:33:10), <anonymous>:56:22)

This may be helpful?:
https://stackoverflow.com/questions/45980598/ngannotate-warning-stringmap-expected-string-key