recent addition of diff2html into zowe/imperative causes webpack to fail

[davidkjackson54]

I have a cli plugin for zowe that I share the classes with a VSCode Explorer extension.
After recent upgrade of the zowe/imperative version level, when I came to compile the VSCode extension using webpack, the compile now fails with this:
`ERROR in ./node_modules/wontache/module.js 1:0
Module parse failed: 'import' and 'export' may appear only with 'sourceType: module' (1:0)
You may need an appropriate loader to handle this file type, currently no loaders are configured to process this file. See https://webpack.js.org/concepts#loaders

import isFunction from 'underscore/modules/isFunction.js';
| import isNumber from 'underscore/modules/isNumber.js';
| import isString from 'underscore/modules/isString.js';
@ ./node_modules/diff2html/lib-esm/hoganjs-utils.js 12:0-32 20:35-43 26:15-23
@ ./node_modules/diff2html/lib-esm/diff2html.js 17:0-43 27:25-37
@ ./node_modules/@zowe/imperative/lib/utilities/src/diff/DiffUtils.js 27:20-40
@ ./node_modules/@zowe/imperative/lib/utilities/index.js 38:13-44
@ ./node_modules/@zowe/imperative/lib/index.js 43:13-35`

diff2html uses wontache under the covers and that was causing an issue with the webpack.

[davidkjackson54]

This solution offered by Timothy seems to have done the trick - added to webpack.config.js

 rules: [{
            test: /\.js$/,
            include: /wontache/,
            type: "javascript/auto"
        },

[t1m0thyj]

This seems to be the best solution for now. It tells Webpack to treat wontache as an ESM module. Found this idea here: webpack/webpack#11597 (comment)

For anyone else encountering this issue, another solution is to add an override to your project's package.json that pins the diff2html version down to "3.4.34" (or any version that does not contain the wontache dependency).

The first solution to add the Webpack rule is probably a better one, as setting package overrides is generally undesirable except as a last resort. Also, the override uses a version of diff2html that relies on 10 year old unmaintained code (see rtfpessoa/diff2html#435).