instance_script.ImportDeclaration() — svelte Function Reference

Architecture documentation for the instance_script.ImportDeclaration() function in index.js from the svelte codebase.

Function javascript Compiler Transformer calls 1

Entity Profile

Compiler→ Transformer→ instance_script.ImportDeclaration() — svelte Function Reference

Dependency Diagram

graph TD
  6287713e_bbf0_a142_26ad_837d3f81d477["instance_script.ImportDeclaration()"]
  cab41022_1b55_3b7a_06c6_b90763bbea47["index.js"]
  6287713e_bbf0_a142_26ad_837d3f81d477 -->|defined in| cab41022_1b55_3b7a_06c6_b90763bbea47
  627dc2f8_4dbc_5bb1_8f54_cee503e17098["get()"]
  6287713e_bbf0_a142_26ad_837d3f81d477 -->|calls| 627dc2f8_4dbc_5bb1_8f54_cee503e17098
  style 6287713e_bbf0_a142_26ad_837d3f81d477 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

packages/svelte/src/compiler/migrate/index.js lines 504–541

	ImportDeclaration(node, { state }) {
		state.props_insertion_point = node.end ?? state.props_insertion_point;
		if (node.source.value === 'svelte') {
			let illegal_specifiers = [];
			let removed_specifiers = 0;
			for (let specifier of node.specifiers) {
				if (
					specifier.type === 'ImportSpecifier' &&
					specifier.imported.type === 'Identifier' &&
					['beforeUpdate', 'afterUpdate'].includes(specifier.imported.name)
				) {
					const references = state.scope.references.get(specifier.local.name);
					if (!references) {
						let end = /** @type {number} */ (
							state.str.original.indexOf(',', specifier.end) !== -1 &&
							state.str.original.indexOf(',', specifier.end) <
								state.str.original.indexOf('}', specifier.end)
								? state.str.original.indexOf(',', specifier.end) + 1
								: specifier.end
						);
						while (state.str.original[end].trim() === '') end++;
						state.str.remove(/** @type {number} */ (specifier.start), end);
						removed_specifiers++;
						continue;
					}
					illegal_specifiers.push(specifier.imported.name);
				}
			}
			if (removed_specifiers === node.specifiers.length) {
				state.str.remove(/** @type {number} */ (node.start), /** @type {number} */ (node.end));
			}
			if (illegal_specifiers.length > 0) {
				throw new MigrationError(
					`Can't migrate code with ${illegal_specifiers.join(' and ')}. Please migrate by hand.`
				);
			}
		}
	},