Adding file extensions to JavaScript import statements with sed-CodePudding

I have a lot of JavaScript files which look like this:

import {equals} from '../booleans/equality-functions'
import {identity} from '../higher-order-functions'
import {defaultValue} from '../type-functions'

export function fold(f) {
    return initialValue => arr => {
        let acc = initialValue

        for (let i = 0; i < arr.length; i  ) {
            acc = f(acc, arr[i], i)
        }

        return acc
    }
}

All I want to do is adding .js to the urls. Meaning I want to convert the import statement import {equals} from '../booleans/equality-functions' to import {equals} from '../booleans/equality-functions.js'.

I guess the best way to do it would be a sed command. Has anybody achieved something similar like this before and could give some advice what kind of regular expression I should use?

Thank you!

CodePudding user response：

With find and sed.

find . -type f -name '*.js' -exec sed -E -i '.bak' "s/(^import.*)(')/\1.j\s\'/g" {}

This will find all imports in all .js files and add .js to the end before the last quote. This will also backup files with a .bak extension. Change the find as needed.

Note: This is not smart enough to figure out of there already exists a .js and will end up add a .js to all imports irrespective.

CodePudding user response：

Using sed

$ sed '/import {[^}]*}/s/.$/.js&/' input_file
import {equals} from '../booleans/equality-functions.js'
import {identity} from '../higher-order-functions.js'
import {defaultValue} from '../type-functions.js'

export function fold(f) {
    return initialValue => arr => {
        let acc = initialValue

        for (let i = 0; i < arr.length; i  ) {
            acc = f(acc, arr[i], i)
        }

        return acc
    }
}