Class ArrayPattern

src/ast/nodes/ArrayPattern.ts:14–125

import type { VariableKind } from './shared/VariableKinds';

export default class ArrayPattern extends NodeBase implements DeclarationPatternNode {
	declare elements: (PatternNode | null)[];
	declare type: NodeType.tArrayPattern;

	addExportedVariables(
		variables: readonly Variable[],
		exportNamesByVariable: ReadonlyMap<Variable, readonly string[]>
	): void {
		for (const element of this.elements) {
			element?.addExportedVariables(variables, exportNamesByVariable);
		}
	}

	declare(
		kind: VariableKind,
		destructuredInitPath: ObjectPath,
		init: ExpressionEntity
	): LocalVariable[] {
		const variables: LocalVariable[] = [];
		const includedPatternPath = getIncludedPatternPath(destructuredInitPath);
		for (const element of this.elements) {
			if (element !== null) {
				variables.push(
					...(element as DeclarationPatternNode).declare(kind, includedPatternPath, init)
				);
			}
		}
		return variables;
	}

	deoptimizeAssignment(destructuredInitPath: ObjectPath, init: ExpressionEntity): void {
		const includedPatternPath = getIncludedPatternPath(destructuredInitPath);
		for (const element of this.elements) {
			element?.deoptimizeAssignment(includedPatternPath, init);
		}
	}

	// Patterns can only be deoptimized at the empty path at the moment
	deoptimizePath(): void {
		for (const element of this.elements) {
			element?.deoptimizePath(EMPTY_PATH);
		}
	}

	hasEffectsWhenDestructuring(
		context: HasEffectsContext,
		destructuredInitPath: ObjectPath,
		init: ExpressionEntity
	): boolean {
		const includedPatternPath = getIncludedPatternPath(destructuredInitPath);
		for (const element of this.elements) {
			if (element?.hasEffectsWhenDestructuring(context, includedPatternPath, init)) {
				return true;
			}
		}
		return false;
	}