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[BUG] Error: marked(): input parameter is of type [object Array], string expected

See original GitHub issue

In v1.1.14, the following happens when I run npx compodoc src/ on https://github.com/googleapis/gax-nodejs repository:

Unhandled Rejection at: Promise {
  <rejected> Error: marked(): input parameter is of type [object Array], string expected
      at marked (/Users/fenster/repos/gax-nodejs/node_modules/marked/src/marked.js:27:11)
      at /Users/fenster/repos/gax-nodejs/node_modules/@compodoc/compodoc/dist/index-cli-32a621dc.js:600:23
      at arrayEach (/Users/fenster/repos/gax-nodejs/node_modules/lodash/lodash.js:530:11)
      at Object.forEach (/Users/fenster/repos/gax-nodejs/node_modules/lodash/lodash.js:9410:14)
      at markedtags (/Users/fenster/repos/gax-nodejs/node_modules/@compodoc/compodoc/dist/index-cli-32a621dc.js:599:18)
      at AngularDependencies.visitFunctionDeclaration (/Users/fenster/repos/gax-nodejs/node_modules/@compodoc/compodoc/dist/index-cli-32a621dc.js:9559:32)
      at parseNode (/Users/fenster/repos/gax-nodejs/node_modules/@compodoc/compodoc/dist/index-cli-32a621dc.js:8984:43)
      at /Users/fenster/repos/gax-nodejs/node_modules/@compodoc/compodoc/dist/index-cli-32a621dc.js:9260:13
      at visitNodes (/Users/fenster/repos/gax-nodejs/node_modules/@ts-morph/common/dist/typescript.js:29004:30)
      at Object.forEachChild (/Users/fenster/repos/gax-nodejs/node_modules/@ts-morph/common/dist/typescript.js:29243:24)
} reason: Error: marked(): input parameter is of type [object Array], string expected
    at marked (/Users/fenster/repos/gax-nodejs/node_modules/marked/src/marked.js:27:11)
    at /Users/fenster/repos/gax-nodejs/node_modules/@compodoc/compodoc/dist/index-cli-32a621dc.js:600:23
    at arrayEach (/Users/fenster/repos/gax-nodejs/node_modules/lodash/lodash.js:530:11)
    at Object.forEach (/Users/fenster/repos/gax-nodejs/node_modules/lodash/lodash.js:9410:14)
    at markedtags (/Users/fenster/repos/gax-nodejs/node_modules/@compodoc/compodoc/dist/index-cli-32a621dc.js:599:18)
    at AngularDependencies.visitFunctionDeclaration (/Users/fenster/repos/gax-nodejs/node_modules/@compodoc/compodoc/dist/index-cli-32a621dc.js:9559:32)
    at parseNode (/Users/fenster/repos/gax-nodejs/node_modules/@compodoc/compodoc/dist/index-cli-32a621dc.js:8984:43)
    at /Users/fenster/repos/gax-nodejs/node_modules/@compodoc/compodoc/dist/index-cli-32a621dc.js:9260:13
    at visitNodes (/Users/fenster/repos/gax-nodejs/node_modules/@ts-morph/common/dist/typescript.js:29004:30)
    at Object.forEachChild (/Users/fenster/repos/gax-nodejs/node_modules/@ts-morph/common/dist/typescript.js:29243:24)
[14:43:21] Sorry, but there was a problem during parsing or generation of the documentation. Please fill an issue on github. (https://github.com/compodoc/compodoc/issues/new)

Operating System, Node.js, npm, compodoc version(s)

MacOS and Linux, Node.js v15.11.0 (but fails on other versions in CI too), npm v7.6.0. compodoc v1.1.13: OK compodoc v1.1.14: fails

Angular configuration, a `package.json` file in the root folder

No Angular. package.json: https://github.com/googleapis/gax-nodejs/blob/e5b2e63b7d3e028c17c1229e6eb547a70e9f4a62/package.json

Compodoc installed globally or locally ?

Locally as a dev dependency

If possible sourcecode of the file where it breaks

If possible your terminal logs before the error

https://gist.github.com/alexander-fenster/3e0aaf1220d2774c4c649260c475a41d

Motivation for or Use Case

Reproduce the error

$ git clone https://github.com/googleapis/gax-nodejs.git
$ cd gax-nodejs
$ git checkout e5b2e63b7d3e028c17c1229e6eb547a70e9f4a62
$ npm install
$ npx compodoc src/