Method parseDirectivePrologues

src/parser.ts:3009–3042

()

    }

    parseDirectivePrologues(): Node.Statement[] {
        let firstRestricted: RawToken | null = null;

        const body: Node.Statement[] = [];
        while (true) {
            const token = this.lookahead;
            if (token.type !== Token.StringLiteral) {
                break;
            }

            const statement = this.parseDirective();
            body.push(statement);
            const directive = (statement as Node.Directive).directive;
            if (typeof directive !== 'string') {
                break;
            }

            if (directive === 'use strict') {
                this.context.strict = true;
                if (firstRestricted) {
                    this.tolerateUnexpectedToken(firstRestricted, Messages.StrictOctalLiteral);
                }
                if (!this.context.allowStrictDirective) {
                    this.tolerateUnexpectedToken(token, Messages.IllegalLanguageModeDirective);
                }
            } else {
                if (!firstRestricted && token.octal) {
                    firstRestricted = token;
                }
            }
        }

        return body;
    }

    // https://tc39.github.io/ecma262/#sec-method-definitions