Function isValidTrigger

test/fixtures/snapshot/typescript.js:135318–135342

(sourceFile, triggerCharacter, contextToken, position)

            return node.parent && ts.isClassOrTypeElement(node.parent) && ts.isObjectTypeDeclaration(node.parent.parent);
        }
        function isValidTrigger(sourceFile, triggerCharacter, contextToken, position) {
            switch (triggerCharacter) {
                case ".":
                case "@":
                    return true;
                case '"':
                case "'":
                case "`":
                    // Only automatically bring up completions if this is an opening quote.
                    return !!contextToken && ts.isStringLiteralOrTemplate(contextToken) && position === contextToken.getStart(sourceFile) + 1;
                case "#":
                    return !!contextToken && ts.isPrivateIdentifier(contextToken) && !!ts.getContainingClass(contextToken);
                case "<":
                    // Opening JSX tag
                    return !!contextToken && contextToken.kind === 29 /* SyntaxKind.LessThanToken */ && (!ts.isBinaryExpression(contextToken.parent) || binaryExpressionMayBeOpenTag(contextToken.parent));
                case "/":
                    return !!contextToken && (ts.isStringLiteralLike(contextToken)
                        ? !!ts.tryGetImportFromModuleSpecifier(contextToken)
                        : contextToken.kind === 43 /* SyntaxKind.SlashToken */ && ts.isJsxClosingElement(contextToken.parent));
                case " ":
                    return !!contextToken && ts.isImportKeyword(contextToken) && contextToken.parent.kind === 305 /* SyntaxKind.SourceFile */;
                default:
                    return ts.Debug.assertNever(triggerCharacter);
            }
        }
        function binaryExpressionMayBeOpenTag(_a) {
            var left = _a.left;
            return ts.nodeIsMissing(left);