Method scanStartOfDeclaration

internal/parser/parser.go:6100–6172

()

}

func (p *Parser) scanStartOfDeclaration() bool {
	for {
		switch p.token {
		case ast.KindVarKeyword, ast.KindLetKeyword, ast.KindConstKeyword, ast.KindFunctionKeyword, ast.KindClassKeyword,
			ast.KindEnumKeyword:
			return true
		case ast.KindUsingKeyword:
			return p.isUsingDeclaration()
		case ast.KindAwaitKeyword:
			return p.isAwaitUsingDeclaration()
		// 'declare', 'module', 'namespace', 'interface'* and 'type' are all legal JavaScript identifiers;
		// however, an identifier cannot be followed by another identifier on the same line. This is what we
		// count on to parse out the respective declarations. For instance, we exploit this to say that
		//
		//    namespace n
		//
		// can be none other than the beginning of a namespace declaration, but need to respect that JavaScript sees
		//
		//    namespace
		//    n
		//
		// as the identifier 'namespace' on one line followed by the identifier 'n' on another.
		// We need to look one token ahead to see if it permissible to try parsing a declaration.
		//
		// *Note*: 'interface' is actually a strict mode reserved word. So while
		//
		//   "use strict"
		//   interface
		//   I {}
		//
		// could be legal, it would add complexity for very little gain.
		case ast.KindInterfaceKeyword, ast.KindTypeKeyword, ast.KindDeferKeyword:
			return p.nextTokenIsIdentifierOnSameLine()
		case ast.KindModuleKeyword, ast.KindNamespaceKeyword:
			return p.nextTokenIsIdentifierOrStringLiteralOnSameLine()
		case ast.KindAbstractKeyword, ast.KindAccessorKeyword, ast.KindAsyncKeyword, ast.KindDeclareKeyword, ast.KindPrivateKeyword,
			ast.KindProtectedKeyword, ast.KindPublicKeyword, ast.KindReadonlyKeyword:
			previousToken := p.token
			p.nextToken()
			// ASI takes effect for this modifier.
			if p.hasPrecedingLineBreak() {
				return false
			}
			if previousToken == ast.KindDeclareKeyword && p.token == ast.KindTypeKeyword {
				// If we see 'declare type', then commit to parsing a type alias. parseTypeAliasDeclaration will
				// report Line_break_not_permitted_here if needed.
				return true
			}
			continue
		case ast.KindGlobalKeyword:
			p.nextToken()
			return p.token == ast.KindOpenBraceToken || p.token == ast.KindIdentifier || p.token == ast.KindExportKeyword
		case ast.KindImportKeyword:
			p.nextToken()
			return p.token == ast.KindDeferKeyword || p.token == ast.KindStringLiteral || p.token == ast.KindAsteriskToken || p.token == ast.KindOpenBraceToken || tokenIsIdentifierOrKeyword(p.token)
		case ast.KindExportKeyword:
			p.nextToken()
			if p.token == ast.KindEqualsToken || p.token == ast.KindAsteriskToken || p.token == ast.KindOpenBraceToken ||