Precompiling with Babel

Precompiling with Babel

PDSL comes with a babel plugin.

This plugin speeds up pdsl in babelified codebases by pre-compiling p-expressions to predicate function definitions.

yarn add --dev @pdsl/babel-plugin-pdsl

You should ensure it is placed before any plugins that affect module import syntax.

{
  plugins: ["@pdsl/babel-plugin-pdsl"];
}

How precompiling works

Conceptually this plugin parses p-expressions and replaces them with function chains:

Example Input:

import p from "pdsl";

const notNil = p`!(null|undefined)`;
const hasName = p`{name}`;
const isTrue = p`true`;
const hasNameWithFn = p`{name:${a => a.length > 10}}`;

Example Output

import { val, not, or, obj, entry, pred } from "pdsl/helpers";

const notNil = val(not(or(val(null), val(undefined))));
const hasName = val(obj("name"));
const isTrue = val(true);
const hasNameWithFn = val(
  obj(
    entry(
      "name",
      pred(a => a.length > 10)
    )
  )
);