The absence of a declaration file for a module results in it implicitly having an 'any' type, particularly when trying to import a portion of a CommonJS module

Presently, the project utilizes a CommonJS module to store configuration values in a single file:

module.exports = {
  classA: `classA`,
  classB: `classB`
  classC: `classC`
}

This makes it easy to reuse these values for creating JS selectors by following this process:

const CLASSES = require('./classes')

const SELECTORS = Object.keys(CLASSES).reduce((obj, key) => {
  const selectorKey = key.replace(`class`, `selector`)

  obj[selectorKey] = `.${CLASSES[key]}`

  return obj
}, {})

module.exports = SELECTORS

The selectors are then used within the code logic and passed to PostCSS config to generate a list of variables for use in .pcss files.

This system is incredibly useful for streamlining development, and with CommonJS, specific values can be imported into components as needed like so:

import { classA } from './path/classes

While this setup has been successful thus far, importing it the same way in a TypeScript file does not meet TSLint constraints and results in an error message:

Could not find a declaration file for module implicitly has an 'any' type
:

Shown below is the tsconfig.json

{
  "compilerOptions": {
    "target": "esnext",
    "module": "esnext",
    "strict": true,
    "jsx": "preserve",
    "importHelpers": true,
    "moduleResolution": "node",
    "experimentalDecorators": true,
    "esModuleInterop": true,
    "allowSyntheticDefaultImports": true,
    "sourceMap": true,
    "noImplicitThis": true,
    "baseUrl": ".",
    "types": [
      "webpack-env",
      "jest"
    ],
    "paths": {
      "@/*": [
        "src/*"
      ]
    },
    "lib": [
      "esnext",
      "dom",
      "dom.iterable",
      "scripthost"
    ]
  },
  "include": [
    "src/**/*.ts",
    "src/**/*.tsx",
    "src/**/*.vue",
    "tests/**/*.ts",
    "tests/**/*.tsx"
  ],
  "exclude": [
    "node_modules"
  ]
}

I am curious if there exists a proper way to satisfy TypeScript requirements and declare module types, or possibly rewrite the current logic while maintaining its functionality.

P.S: After consulting with a duck, I realized that converting it into a TypeScript module may prevent the ability to import selectors in the postcss config due to its lack of support for ES6 import

Answer №1

To solve this issue, I discovered that including the "allowJs": true, option in the tsconfig.js file did the trick.

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