tally/eol-last

Enforces a newline at the end of non-empty files.

Property	Value
Severity	Style
Category	Style
Default	Enabled
Auto-fix	Yes (safe)

Description

POSIX defines a line as a sequence of characters ending with a newline. Files that lack a trailing newline can cause issues with file concatenation, produce messy diffs in version control, and interfere with shell prompts when printed with cat. This rule enforces (or prohibits) a final newline in Dockerfiles, mirroring ESLint’s eol-last rule. In the default "always" mode, the rule reports a violation when a non-empty file does not end with \n. In "never" mode, it reports when a file does end with \n. Empty files (zero bytes) are always ignored.

Companion editor configuration

Use EditorConfig integration to configure IDEs and editors to insert the final newline before tally reports it.

Examples

Bad (mode: “always”)

FROM alpine:3.20
RUN apk --no-cache add ca-certificates
ENTRYPOINT ["/app"]⌁

(where ⌁ marks the end of file with no trailing newline)

Good (mode: “always”)

FROM alpine:3.20
RUN apk --no-cache add ca-certificates
ENTRYPOINT ["/app"]

Configuration

Default (no config needed):

# Enabled by default with mode = "always"

Disable the rule:

[rules.tally.eol-last]
severity = "off"

Require files to not end with a newline:

[rules.tally.eol-last]
mode = "never"

Options

Option	Type	Default	Description
`mode`	string	`"always"`	`"always"` requires a final newline; `"never"` prohibits it

Auto-fix

This rule provides a safe auto-fix:

tally lint --fix Dockerfile

In "always" mode, a missing final newline is appended.
In "never" mode, the trailing newline is removed.

tally/no-multiple-empty-lines — controls excess blank lines at the end (and beginning) of files
tally/no-trailing-spaces — removes trailing whitespace on individual lines

​Description

​Companion editor configuration

​Examples

​Bad (mode: “always”)

​Good (mode: “always”)

​Configuration

​Options

​Auto-fix

​Related Rules