Build fails with "Unexpected token ] in JSON" after updating to version 9

[filipesilva]

This issue impacts 9.0.0-rc.0 and happened while updating https://github.com/SAP/cloud-commerce-spartacus-storefront.

After updating successfully to version 9, but build fails with Unexpected token ] in JSON at position 195 after seeming to finish successfully.

kamik@RED-X1C6 MINGW64 /d/sandbox/cloud-commerce-spartacus-storefront (update-9)
$ yarn build
yarn run v1.17.3
$ ng build storefrontapp --prod
Generating ES5 bundles for differential loading...
ES5 bundle generation complete.

chunk {0} runtime-es2015.52756d3ab8e6582f0541.js (runtime) 1.45 kB [entry] [rendered]
chunk {0} runtime-es5.52756d3ab8e6582f0541.js (runtime) 1.45 kB [entry] [rendered]
chunk {2} polyfills-es2015.9d25e173e20e35a89c7c.js (polyfills) 49.4 kB [initial] [rendered]
chunk {3} polyfills-es5.c526f8e419af7aac625d.js (polyfills-es5) 138 kB [initial] [rendered]
chunk {1} main-es2015.229b1ef42e6e191943e4.js (main) 1.29 MB [initial] [rendered]
chunk {1} main-es5.229b1ef42e6e191943e4.js (main) 1.5 MB [initial] [rendered]
chunk {4} styles.da4c41d41cbf7725e5f1.css (styles) 350 kB [initial] [rendered]
Date: 2019-11-01T18:08:48.998Z - Hash: 2dc34f91b4b37faf77fa - Time: 120820ms
Unexpected token ] in JSON at position 195
error Command failed with exit code 1.
info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.

[alan-agius4]

The root cause of the issue seems to be the same as #15462 to be more precise the appendValueInAstArray

angular-cli/packages/schematics/angular/utility/json-utils.ts

Line 152 in 07780b9

export function appendValueInAstArray(

method.

The failing part here is the SW generation and the error is coming from when trying to parse the ngsw config.

[alan-agius4]

Also related #14776

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