🏷 Map template literal expression interpolations with ease.

npm install --save map-tag

Returns a function that can be used for tagging template literals.

The provided mapper is invoked with Array-method style arguments (expression, i, expressions) for each expression being interpolated into the template literal, where:

• expression is the current expression
• i is the position of expression in the list of expressions
• expressions is every expression

You can provide a this context for the mapper function via the mapperContext parameter, or use the default value of null.

The values returned from mapper will be used instead of the original expressions passed to the template literal.

import mapTag from 'map-tag'

const uppercase = mapTag(expression =>
  String.prototype.toUpperCase.call(expression)
)

const name = 'jane'
const role = 'dentist'

uppercase`hello ${ name }, you're a great ${ role }!`
// <- 'hello JANE, you're a great DENTIST!'

import mapTag from 'map-tag'

const encodeParams = mapTag(encodeURIComponent)

const collection = 'Log'
const query = '{}'
const fields = 'level'
const page = 2

encodeParams`/database/${ collection }/${ query }/${ fields }/${ page }`
// <- '/database/Log/%7B%7D/level/2'

mit