restrict-imports-loader/dist/deciders.mjs

A Webpack loader to restrict imports in ES and TypeScript

import * as path from "path";
const UP_ONE_LEVEL_LENGTH = 3;
const REGEX_UP_LEVELS = new RegExp(String.raw `(?:\.\.\/)+`, "g");
export function everythingInPackage(packageName) {
    return matchedBy(new RegExp(String.raw `^${packageName}(\/.*)?$`));
}
export function matchedBy(r) {
    return importPath => Promise.resolve({ restricted: r.test(importPath) });
}
export function climbingUpwardsMoreThan(levels) {
    return importPath => {
        const maxLength = lengthOfLongestMatch(normalize(importPath).match(REGEX_UP_LEVELS));
        const maxClimbs = maxLength / UP_ONE_LEVEL_LENGTH;
        const s = maxClimbs === 1 ? "" : "s";
        return Promise.resolve({
            restricted: maxClimbs > levels,
            info: `(contains ${maxClimbs} consecutive occurrence${s} of "../"; max ${levels} allowed)`,
        });
    };
}
function lengthOfLongestMatch(matches) {
    return (matches === null
        ? 0
        : matches.reduce((acc, m) => Math.max(acc, m.length), 0));
}
function normalize(importPath) {
    return importPath.replace(/\/+/g, "/").replace(/\/\.\//g, "/");
}
export const everythingInside = everything(true);
export const everythingOutside = everything(false);
function everything(insideIsRestricted) {
    return dirs => {
        return (importPath, loaderContext) => new Promise((resolve, reject) => {
            loaderContext.resolve(loaderContext.context, importPath, (err, result) => {
                if (err === null) {
                    resolve({
                        restricted: insideIsRestricted === dirs.some(contains(result)),
                        info: `(resolved: ${result})`,
                    });
                }
                else {
                    reject(err.message);
                }
            });
        });
    };
}
function contains(contained) {
    return dir => {
        const relative = path.relative(dir, contained);
        return !relative.startsWith("..") && !path.isAbsolute(relative);
    };
}
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