check_bundle() — svelte Function Reference

Architecture documentation for the check_bundle() function in check-treeshakeability.js from the svelte codebase.

Function javascript BuildSystem QualityControl

Entity Profile

BuildSystem→ QualityControl→ check_bundle() — svelte Function Reference

Dependency Diagram

graph TD
  1cd82827_acca_004a_c145_7eb440520ec5["check_bundle()"]
  a1cf3ce1_4e6b_8aaa_e102_ea18e7bc71ed["check-treeshakeability.js"]
  1cd82827_acca_004a_c145_7eb440520ec5 -->|defined in| a1cf3ce1_4e6b_8aaa_e102_ea18e7bc71ed
  style 1cd82827_acca_004a_c145_7eb440520ec5 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/svelte/scripts/check-treeshakeability.js lines 125–146

function check_bundle(case_name, ...strings) {
	for (const string of strings) {
		const index = bundle.indexOf(string);
		if (index >= 0) {
			// eslint-disable-next-line no-console
			console.error(`❌ ${case_name} not treeshakeable`);
			failed = true;

			let lines = bundle.slice(index - 500, index + 500).split('\n');
			const target_line = lines.findIndex((line) => line.includes(string));
			// mark the failed line
			lines = lines
				.map((line, i) => (i === target_line ? `> ${line}` : `| ${line}`))
				.slice(target_line - 5, target_line + 6);
			// eslint-disable-next-line no-console
			console.error('The first failed line:\n' + lines.join('\n'));
			return;
		}
	}
	// eslint-disable-next-line no-console
	console.error(`✅ ${case_name} treeshakeable`);
}