VIEW019: output-param-never-written

Output parameter is never written

Code	VIEW019
Name	output-param-never-written
Category	View structure (VIEW)
Default severity	info
Enabled by default	no
Fix available	no
ign-lint equivalent	none

What it does

Reports view parameters with paramDirection: "output" that nothing in the view writes: no binding on the parameter, no bidirectional property binding targeting it, and no script assignment (self.view.params.result = ..., found on the parsed scripts; see VIEW015 for how scripts are followed). Views whose scripts use the parameters in a way that cannot be followed are not reported.

Why is this bad?

An output parameter exists so the embedding view can read a value back. If the view never sets it, the caller always sees the default stored in view.json, which is usually a mistake (a parameter that should be an input, or a forgotten assignment).

Example

{"params": {"selected": null},
 "propConfig": {"params.selected": {"paramDirection": "output"}}}

Use instead: bind the parameter ("binding": {"type": "property", ...}) or assign it in a script, or make it an input.

ign-lint

No equivalent.

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Generated from the rule metadata by iglint generate-docs; iglint rule VIEW019 prints the same page in the terminal. Source: docs/rules/VIEW019.md.