Module schema: Template expressions

Legend

Notation	Meaning
`T[]`	Array of `T`
`map<string,T>`	Object keyed by strings with `T` values
`enum[a,b]`	One of the listed values
`A \| B`	One of several types
~template	Field accepts `<< ... >>` template expressions

Template expressions

Fields marked templateable accept << expression >> template tokens.

Block mode preserves the resolved type:
timeout: << module.input.timeout >>
Interpolation mode always produces a string:
name: "prefix-<< module.input.env >>"

Supported operators: +, -, *, /, %, >, <, >=, <=, ==, !=, &&, ||, !.Ternary: << condition ? trueVal : falseVal >>. Default fallback: << input.x || "fallback" >>.Access: array[0], map["key"], map.key. Functions: len(), upper(), lower().Escaping: write \<< to emit a literal <<; an escaped block is kept as text and never evaluated. A backslash that itself needs to be literal doubles (\\<< is a live template preceded by a backslash).Available namespaces: module.input.*, stack.output.* (own stack outputs; module.output.* is an accepted alias), stack.id, trigger.payload.{branch,commit,ref,repository,event,tag}.Array spreads can insert an array expression into an array field:

logs:
  - ...<< map(module.input.enabled_cloudwatch_logs_exports, {
      "id":"rds_" + # + "_logs",
      "name":"RDS " + # + " logs",
      "source":{
        "type":"cloudwatch",
        "aws_account_id":module.input.aws_account_id,
        "region":stack.output.region,
        "log_group":"/aws/rds/instance/" + stack.output.db_instance_identifier + "/" + #
      }
    }) >>

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Module schema: Template expressions

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Template expressions

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​Template expressions

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Template expressions