knip/dist/PackageJsonPeeker.js

Find and fix unused dependencies, exports and files in your TypeScript and JavaScript projects

export class PackageJsonPeeker {
    manifestStr;
    lines = [];
    sections = {};
    ready = false;
    constructor(manifestStr) {
        this.manifestStr = manifestStr;
    }
    init() {
        this.lines = this.manifestStr.split('\n');
        let pos = 0;
        for (let i = 0; i < this.lines.length; i++) {
            const line = this.lines[i];
            const section = line.indexOf('"dependencies"') !== -1
                ? 'dependencies'
                : line.indexOf('"devDependencies"') !== -1
                    ? 'devDependencies'
                    : line.indexOf('"optionalPeerDependencies"') !== -1
                        ? 'optionalPeerDependencies'
                        : undefined;
            if (section)
                this.sections[section] = { startLine: i, startPos: pos };
            pos += line.length + 1;
        }
    }
    getLocation(type, packageName) {
        if (!this.ready)
            this.init();
        const lines = this.lines;
        const section = this.sections[type];
        if (lines.length === 0 || !section)
            return;
        let pos = section.startPos + lines[section.startLine].length + 1;
        for (let i = section.startLine + 1; i < lines.length; i++) {
            const line = lines[i];
            if (line.includes(`"${packageName}"`)) {
                const col = line.indexOf(packageName);
                return { line: i + 1, col: col + 1, pos: pos + col };
            }
            pos += line.length + 1;
        }
    }
}