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strings with escaping expression templates, evaluating the expressions and returning a new string or the value evaluated from the expression","maintainers":[{"email":"dev@aircall.io","name":"aircall-ci"}],"readme":"# expression-parser\n\nResolves templated expressions in a secure local scope.\n\n## `resolveExpression` function\n\nArguments:\n\n- `expression`: expression templated string\n- `context` (optional): context from where to resolve expressions\n- `options` (optional): parser options:\n - `passContextToEmptyFunctions?: boolean` (default `true`): Allow to pass the context object into\n empty functions calls in single expression strings. Anonymous functions are not supported\n - `transformArrayNegativeIndex?: boolean` (default `true`): Allow and parse negative indexes\n correctly\n\nExample:\n\n```TypeScript\nimport { resolveExpression } from '@aircall/expression-parser'\n\nconst template = 'Start: ${variable.start}, End ${variable.end}'\nconst context = {\n start: '09:00',\n end: '12:00',\n}\n\nresolveExpression(template, context);\n// returns 'Start: 09:00, End 12:00'\n```\n\nThere are some use cases in the [E2E tests](src/__tests__/e2e/parser.e2e.ts)\n\n### Default expression handling\n\nDefault expressions come in the form of `${}`. The templates are\ndelimited with `${` and `}` strings and all the JavaScript code inside will be evaluated. If there\nis more than one expression or there is some text around the template, it will return a string\nevaluating all of them.\n\nFor example, with this context:\n\n```JavaScript\n{\n content: {\n input: 2,\n id: 'operation',\n executionId: 1234,\n },\n environment: {\n variables: {\n input: 1,\n inputArray: [1, 2, 3],\n inputObject: {\n 'spaced name': 'name'\n },\n getInput: (context) => {\n return context.environment.variables.input;\n },\n isBelow: (a, b) => a < b,\n commonVariablePrefix: \"a\",\n current: 2,\n },\n}\n```\n\nThe following expressions are supported:\n\n| Template | Result | More information |\n| ---------------------------------------------------------- | -------------------------------------- | ------------------------------------------------------------------------------- |\n| `${environment.variables.input}` | `1` | |\n| `${environment.variables.inputArray[0]}` | `1` | resolves to first item of the variable input array |\n| `${environment.variables.inputArray[-1]}` | `3` | resolves to last item of the variable input array |\n| `${environment.variables.inputObject['spaced name']}` | `'name'` | resolves to the variable input object property `spaced name` |\n| `${environment.services.getInput()}` | `1` | executes the service function `getInput` with the context passed as an argument |\n| `${environment.services.getInput}` | `Function getInput()` | returns the service function |\n| `${environment.services.isBelow(content.input,2)}` | `false` | executes the service function `isBelow` with `content.input` value and 2 |\n| `I, ${content.id}, execute with id ${content.executionId}` | `'I, operation, execute with id 1234'` | formats a string getting content object values |\n| `${true}` | `true` | |\n| `${false}` | `false` | |\n| `${null}` | `null` | |\n| `${undefined}` | `undefined` | |\n| `${}` | `` | returns the number passed |\n| `${() => {}}` | `() => {}` | returns the lambda function |\n\n> It is possible to nest multiple expressions if you write them in proper JavaScript code. For\n> example:\n>\n> Given this context:\n>\n> ```JavaScript\n> {\n> environment: {\n> variables: {\n> a1: (v) => `method a1: ${v}`,\n> a2: (v) => `method a2: ${v}`,\n> a3: (v) => `method a3: ${v}`,\n> },\n> commonVariablePrefix: \"a\",\n> current: 2,\n> },\n> };\n> ```\n>\n> The expression\n>\n> ```JavaScript\n> ${environment.variables[`${environment.commonVariablePrefix}${environment.current}`]}\n> ```\n>\n> returns the function:\n>\n> ```JavaScript\n> (v) => `method a2: ${v}`\n> ```\n","readmeFilename":"README.md"}