27 lines
809 B
Markdown
27 lines
809 B
Markdown
---
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title: System built-ins
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description: >
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When a built-in value is not expressible in Flux, its value may be defined by the hosting environment.
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All such values must have a corresponding builtin statement to declare the existence and type of the built-in value.
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aliases:
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- /v2.0/reference/flux/language/built-ins/system-built-ins/
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menu:
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v2_0_ref:
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name: System built-ins
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parent: Flux specification
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weight: 206
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---
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When a built-in value is not expressible in Flux, its value may be defined by the hosting environment.
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All such values must have a corresponding builtin statement to declare the existence and type of the built-in value.
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```js
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BuiltinStatement = "builtin" identifier ":" TypeExpression .
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```
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##### Example
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```js
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builtin from : (bucket: string, bucketID: string) -> stream
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```
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