TypeError: Cannot match against 'undefined' or 'null'.

[mrtomhoward]

I've been using 1.1.0 for a few months without issue.

When I upgraded to 1.2.0 and updated preact.config.js as per the doc, I keep getting this error on build:

Error: Error at /{preact-dir}/preact.config.js:
TypeError: Cannot match against 'undefined' or 'null'.

I get this same error whether my preact.config.js is verbatim from the doc:

import envVars from 'preact-cli-plugin-env-vars';

export default function (config, env, helpers) {
  envVars(config, env, helpers);
}

.... or with my customizations that were in the previous working version:

const envVars = require('preact-cli-plugin-env-vars')
const preactCliSwPrecachePlugin = require('preact-cli-sw-precache')

export default function (config, env, helpers) {

  envVars(config, env, helpers)

  const precacheConfig = {
    staticFileGlobs: [
      'app/css/**.css',
      'app/**.html',
      'app/images/**.*',
      'app/js/**.js'
    ],
    stripPrefix: 'app/',
    runtimeCaching: [{
      urlPattern: /this\\.is\\.a\\.regex/,
      handler: 'networkFirst'
    }]
  };

  return preactCliSwPrecachePlugin(config, precacheConfig)

}

Everything works fine again when I revert to 1.1.0 and change preact.config.js back to the way it was.

Any ideas on what I'm doing wrong?

[robinvdvleuten]

@mrtomhoward thanks for reporting this! I guess it slipped through with my own project's preact configuration. It should be fixed in v1.2.1.