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/*
* Elasticsearch B.V licenses this file to you under the MIT License.
* See `packages/kbn-handlebars/LICENSE` for more information.
*/
// @ts-expect-error: Could not find a declaration file for module
import { createFrame } from 'handlebars/dist/cjs/handlebars/utils';
import type { AmbiguousHelperOptions, DecoratorOptions } from './types';
export function isBlock(node: hbs.AST.Node): node is hbs.AST.BlockStatement {
return 'program' in node || 'inverse' in node;
}
export function isDecorator(
node: hbs.AST.Node
): node is hbs.AST.Decorator | hbs.AST.DecoratorBlock {
return node.type === 'Decorator' || node.type === 'DecoratorBlock';
}
export function toDecoratorOptions(options: AmbiguousHelperOptions) {
// There's really no tests/documentation on this, but to match the upstream codebase we'll remove `lookupProperty` from the decorator context
delete (options as any).lookupProperty;
return options as DecoratorOptions;
}
export function noop() {
return '';
}
// liftet from handlebars lib/handlebars/runtime.js
export function initData(context: any, data: any) {
if (!data || !('root' in data)) {
data = data ? createFrame(data) : {};
data.root = context;
}
return data;
}
// liftet from handlebars lib/handlebars/compiler/compiler.js
export function transformLiteralToPath(node: { path: hbs.AST.PathExpression | hbs.AST.Literal }) {
const pathIsLiteral = 'parts' in node.path === false;
if (pathIsLiteral) {
const literal = node.path;
// @ts-expect-error: Not all `hbs.AST.Literal` sub-types has an `original` property, but that's ok, in that case we just want `undefined`
const original = literal.original;
// Casting to string here to make false and 0 literal values play nicely with the rest
// of the system.
node.path = {
type: 'PathExpression',
data: false,
depth: 0,
parts: [original + ''],
original: original + '',
loc: literal.loc,
};
}
}
export function allowUnsafeEval() {
try {
new Function();
return true;
} catch (e) {
return false;
}
}
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