@glimmer/runtime
Version:
Minimal runtime needed to render Glimmer templates
43 lines (32 loc) • 3.55 kB
JavaScript
import { createComputeRef } from '@glimmer/reference';
import { reifyPositional } from '@glimmer/runtime';
import { internalHelper } from './internal-helper';
const isEmpty = value => {
return value === null || value === undefined || typeof value.toString !== 'function';
};
const normalizeTextValue = value => {
if (isEmpty(value)) {
return '';
}
return String(value);
};
/**
Concatenates the given arguments into a string.
Example:
```handlebars
{{some-component name=(concat firstName " " lastName)}}
{{! would pass name="<first name value> <last name value>" to the component}}
```
or for angle bracket invocation, you actually don't need concat at all.
```handlebars
<SomeComponent @name="{{firstName}} {{lastName}}" />
```
@public
@method concat
*/
export default internalHelper(({
positional
}) => {
return createComputeRef(() => reifyPositional(positional).map(normalizeTextValue).join(''), null, 'concat');
});
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