Flutter package to parse iCalendar (.ics) files.

Guillaume Roux

Last update: Jan 3, 2023

Overview

icalendar_parser

Package to parse iCalendar (.ics) files written in pure Dart.

Implementation of AnyFetch's ics-parser in JavaScript.

Getting Started

Add icalendar_parser to your pubspec.yaml:

icalendar_parser: any

How to use

You can refer to the example/ folder for a complete example implemented in Flutter.

Constructor

ICalendar.fromString

import 'package:flutter/services.dart' show rootBundle;
import 'package:icalendar_parser/icalendar_parser.dart';

final icsString = await rootBundle.loadString('assets/your_file.ics');
final iCalendar = ICalendar.fromString(icsString);

ICalendar.fromLines

final icsLines = await File('your_file.ics').readAsLines();
final iCalendar = ICalendar.fromLines(lines);

Other methods

ICalendar.registerField

With this method you can add fields that are not already supported (check Supported Properties) to the parsing and you can specify a custom function to parse its content :

ICalendar.registerField(field: 'TEST');

ICalendar.registerField(
    field: 'TEST2',
    function: (value, params, event, lastEvent) {
        lastEvent['test2'] = 'test';
        return lastEvent;
    },
);

ICalendar.unregisterField

With this method you can remove parsed fields to ignore them in your file :

ICalendar.unregisterField('TEST');

ICalendar.toJson

Convert [ICalendar] object to a Map<String, dynamic> containing all its data, formatted into a valid JSON Map<String, dynamic> .

final icsObj = ICalendar.fromLines(File('assets/my_file.ics').readAsLinesSync());
print(jsonEncode(icsObj.toJson()));

Input

BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//hacksw/handcal//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
UID:[email protected]
DTSTAMP:19970714T170000Z
ORGANIZER;CN=John Doe:MAILTO:[email protected]
DTSTART:19970714T170000Z
DTEND:19970715T035959Z
SUMMARY:Bastille Day Party
GEO:48.85299;2.36885
END:VEVENT
END:VCALENDAR

Output

{
   "version":"2.0",
   "prodid":"-//hacksw/handcal//NONSGML v1.0//EN",
   "calscale":"GREGORIAN",
   "method":"PUBLISH",
   "data":[
      {
         "type":"VEVENT",
         "uid":"[email protected]",
         "dtstamp":"1997-07-14T17:00:00.000Z",
         "organizer":{
            "name":"John Doe",
            "mail":"[email protected]"
         },
         "dtstart":"1997-07-14T17:00:00.000Z",
         "dtend":"1997-07-15T03:59:59.000Z",
         "summary":"Bastille Day Party",
         "geo":{
            "latitude":48.85299,
            "longitude":2.36885
         }
      }
   ]
}

Supported Properties

VERSION
PRODID
CALSCALE
METHOD
COMPONENT: BEGIN
COMPONENT: END
DTSTART
DTEND
DTSTAMP
TRIGGER
LAST-MODIFIED
COMPLETED
DUE
UID
SUMMARY
DESCRIPTION
LOCATION
URL
ORGANIZER
GEO
CATEGORIES
ATTENDEE
ACTION
STATUS
SEQUENCE
REPEAT
RRULE

Comments

Issue with Multiline Descriptions

BEGIN:VCALENDAR
METHOD:PUBLISH
PRODID:-//Moodle Pty Ltd//NONSGML Moodle Version 2020061501//EN
VERSION:2.0
BEGIN:VEVENT
UID:[email protected]
SUMMARY:200925 - Einfache Schlange (Warteschlange Freizeitpark) ist fällig.
DESCRIPTION:Bearbeitet im Net-Schulbuch auf der Seite "baab_aufgaben" die A
	ufgabe 3.\n\nLadet eure Lösungen als zip-Datei hier hoch.\n\n
	
CLASS:PUBLIC
LAST-MODIFIED:20201009T103237Z
DTSTAMP:20201023T110413Z
DTSTART:20201005T080000Z
DTEND:20201005T080000Z
CATEGORIES:Q1_GK IF 1_Kock
END:VEVENT
BEGIN:VEVENT
UID:[email protected]
SUMMARY:Testaufgabe ist fällig.
DESCRIPTION:Agrobusiness - Lösung des Welternährungsproblems\n\n
CLASS:PUBLIC
LAST-MODIFIED:20201006T201443Z
DTSTAMP:20201023T110413Z
DTSTART:20201005T220000Z
DTEND:20201005T220000Z
CATEGORIES:Q1_LK_EK1_Muel
END:VEVENT
BEGIN:VEVENT
UID:[email protected]
SUMMARY:Verschiedene Übungen als Vorbereitung auf die anstehende Klausur zu
	m Thema "sprachliche Varietäten" ist fällig.
	
DESCRIPTION:1. Stelle alle Positionen zum Thema "Kiezdeutsch" in einer ausf
	ührlichen Tabelle zusammen zusammen.\n\n2. Schreibt Definitionen für die Sp
	rachvarietäten "Dialekt" und "Soziolekt.\n\n3. Stellt tabellarisch die Vor-
	 und Nachteile des Sprechens von Dialekten dar.\n\n4. Schreibt die Merkmale
	 von Dialekt\, Kiezdeutsch sowie Jugendsprache auf. Beachtet dabei auch Gra
	mmatik\, Semantik und Phonetik.\n\n
	
CLASS:PUBLIC
LAST-MODIFIED:20201023T084557Z
DTSTAMP:20201023T110413Z
DTSTART:20201006T220000Z
DTEND:20201006T220000Z
CATEGORIES:Q1_GK D_Hölv
END:VEVENT
BEGIN:VEVENT
UID:[email protected]
SUMMARY:Tasks to the topic of GB ist fällig.
DESCRIPTION:1. Send me your lectures (Referate bitte einstellen).\n\n2. Cho
	ose one character from the movie we are going to watch soon. give reasons w
	hy you have decided to write about this character\, why or why not you like
	 it. Write about his/ her situation and the way he oder she is dealing with
	 the arising conflicts. You should additionally comment on the character an
	d maybe suggest ways that could support the character. Feel free to utter y
	our feelings\, questions or to add criticism on some kind of behaviour\, fo
	r example.\n\n
	
CLASS:PUBLIC
LAST-MODIFIED:20201023T092950Z
DTSTAMP:20201023T110413Z
DTSTART:20201006T220000Z
DTEND:20201006T220000Z
CATEGORIES:Q1_GK E2_Hölv
END:VEVENT
BEGIN:VEVENT
UID:[email protected]
SUMMARY:Testaufgabe ist fällig.
DESCRIPTION:Hallo zusammen\,\n\nhier kommt eine Testaufgabe für euch! Bitte
	 fotografiert eine Steckdose und sendet mir das Foto über Logineo zu.\n\nHe
	rzliche Grüße\n\nvon Frau Haase\n\n
	
CLASS:PUBLIC
LAST-MODIFIED:20200930T181945Z
DTSTAMP:20201023T110413Z
DTSTART:20201007T140000Z
DTEND:20201007T140000Z
CATEGORIES:Q1_GK_Physik_Haase
END:VEVENT
BEGIN:VEVENT
UID:[email protected]
SUMMARY:201009 - Generische Queue (Musikwuensche) ist fällig.
DESCRIPTION:Liebe Schülerinnen und Schüler\,\n\nbearbeitet im Net-Schulbuch
	 auf der Seite baab_aufgabe2 die Aufgaben 1 und 2. Für Aufgabe 2 verwendet 
	die Datei im Anhang.\n\nDiese müsst ihr herunterladen und "extrahieren". Sp
	eichert sie beim Extrahieren in einem geeigneten Verzeichnis.\n\nHinweis: A
	uf der Seite baab_queue findet ihr eine Erklärung zur generischen Schlange.
	\n
	
CLASS:PUBLIC
LAST-MODIFIED:20201009T103223Z
DTSTAMP:20201023T110413Z
DTSTART:20201011T210000Z
DTEND:20201011T210000Z
CATEGORIES:Q1_GK IF 1_Kock
END:VEVENT
END:VCALENDAR

This is my full .ics and as you can see the descriptions are multiline strings but after parsing only the first line (the one after DESCRIPTION:) is stored.

bug

opened by phibr0 7

Date is not correctly parsed

Hi!

DTSTART;TZID=Europe/Berlin:20210607T090000

is being parsed as

DateTime:<2021-10-31 01:00:00.000Z>

As you can see the date and time is incorrectly parsed. :-( I think using "DateTime.parse(text)" is not enough.

opened by dg76 5

Google Calendar ical `EXDATE not correctly parsed

Google Calendar's implementation of EXDATE does not follow the specification. Instead of comma-separated datetimes, each EXDATE is written to a new line.

Therefore only the last EXDATE is in the parsed object.

Example:

BEGIN:VEVENT
DTSTART;TZID=Europe/Berlin:20221205T000000
DTEND;TZID=Europe/Berlin:20221205T020000
RRULE:FREQ=DAILY
EXDATE;TZID=Europe/Berlin:20221210T000000
EXDATE;TZID=Europe/Berlin:20221208T000000
DTSTAMP:20221206T203724Z
UID:[email protected]
CREATED:20221206T102926Z
LAST-MODIFIED:20221206T102926Z
LOCATION:
SEQUENCE:0
STATUS:CONFIRMED
SUMMARY:Just a quick summary
TRANSP:OPAQUE
END:VEVENT

bug

opened by Fix007 3

Exception on `ORGANIZER` field parsing

There is an issue with parsing ICS containing partial ORGANIZER field (with no email specified):

BEGIN:VCALENDAR
VERSION:2.0
CALSCALE:GREGORIAN
BEGIN:VEVENT
UID:ac6d76d2-deb8-421d-86c6-670c06d5cd8c
SUMMARY:Cool event
DTSTAMP:20211004T074300Z
DTSTART:20211006T063000Z
DTEND:20211006T073000Z
DESCRIPTION:Some description
ORGANIZER;CN=Joe Jackson
END:VEVENT
END:VCALENDAR

Produces following exception:

type 'String' is not a subtype of type 'List<String>' of 'other'

#1      ICalendar.fromListToJson (package:icalendar_parser/src/model/icalendar.dart:253:35)

bug

opened by Toshik 3

Error while parsing I Calendar

Hello, first of all this is probably the wrong place but I'm quite new, so im Sorry. I really need to parse an .ics File for my Project but for some reason it doesn't work, also your package is the only one which seems to be capable of doing that.

My understanding is that the Method getEvents() should return a List of CalendarItem's, but it always gives the following error. Also here is my .ics file (I needed to rename it .txt just change the file extension icalexport.txt ).

My Code:

import 'package:flutter/services.dart' show rootBundle;
import 'package:icalendar_parser/icalendar_parser.dart';

Future getData() async {
  final icsString = await rootBundle.loadString('assets/icalexport.ics');
  final iCalendar = ICalendar.fromString(icsString);
  print(iCalendar);
  return iCalendar;
}

Future getEvents() async {
  ICalendar iCalendar = await getData();
  List<CalendarItem> items;

  for (var item in iCalendar.data) {
    items.add(CalendarItem.fromJson(item));
  }
  print(items);
  return items;
}

class CalendarItem {
  final String type;
  final String uid;
  final String name;
  final String description;
  final String categories;

  CalendarItem({
    this.type,
    this.uid,
    this.name,
    this.description,
    this.categories,
  });

  factory CalendarItem.fromJson(Map<String, dynamic> json) {
    return CalendarItem(
      type: json['type'] as String ?? 'empty',
      uid: json['uid'] as String ?? 'empty',
      name: json['name'] as String ?? 'empty',
      description: json['description'] as String ?? 'empty',
      categories: json['categorie'] as String ?? 'empty',
    );
  }
}

Error Message:

E/flutter ( 9628): [ERROR:flutter/lib/ui/ui_dart_state.cc(177)] Unhandled Exception: NoSuchMethodError: The method 'add' was called on null.
E/flutter ( 9628): Receiver: null
E/flutter ( 9628): Tried calling: add(Instance of 'CalendarItem')

bug

opened by phibr0 3

Export ics_datetime.dart

By exporting IcsDateTime, it gets included in documentation and users can use it as a type in their code. It also allows IDEs to auto-complete code such as icsDateTime.toDateTime().

opened by Levi-Lesches 2
Error while loading in new .ics File!

Many auto generated .ics Files end with an empty line under the END:VCALENDAR, but this package throws an error saying the file doesnt end with an END:VCALENDAR Statement. If i find some time in the near future i will propably open a Pull Request fixing this issue.
enhancement

opened by phibr0 2
Bump coverage from 1.2.0 to 1.6.1
⚠️ Dependabot is rebasing this PR ⚠️

Rebasing might not happen immediately, so don't worry if this takes some time.

Note: if you make any changes to this PR yourself, they will take precedence over the rebase.

Bumps coverage from 1.2.0 to 1.6.1.

Changelog

Sourced from coverage's changelog.

1.6.1

Handle SentinelExceptions thrown by vm_service.

1.6.0

Update to vm_service 9.4.0.

Use IsolateRef.isolateGroupId to speed up coverage collection.

Ignore uncoverable abstract methods.

Fix bug where 'ingore-line' comments etc are applied even if they're inside string literals.

Change the LICENSE file to the standard Dart BSD license.

1.5.0

Support passing extra arguments to test_with_coverage which are then passed to package:test.

Example: dart run coverage:test_with_coverage -- --preset CI

1.4.0

Added HitMap.parseJsonSync which takes a cache of ignored lines which can speedup calls when checkIgnoredLines is true and the function is called several times with overlapping files in the input json.

Bump the version of vm_service to 9.0.0.

1.3.2

Fix test_with_coverage listening to an unsupported signal on windows.

Fix --reportOn on windows using incorrect path separators.

1.3.1

Fix running dart pub global run coverage:test_with_coverage or dart run coverage:test_with_coverage

1.3.0

Bump the minimum Dart SDK version to 2.15.0

Add a --package flag, which takes the package's root directory, instead of the .package file. Deprecate the --packages flag.

Deprecate the packagesPath parameter and add packagePath instead, in HitMap.parseJson, HitMap.parseFiles, createHitmap, and parseCoverage.

Add a new executable to the package, test_with_coverage. This simplifies the most common use case of coverage, running all the tests for a package, and generating an lcov.info file.

Use the libraryFilters option in getSourceReport to speed up coverage runs that use scopedOutput.

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dependencies
opened by dependabot[bot] 1
Bump lint from 1.10.0 to 2.0.1
Bumps lint from 1.10.0 to 2.0.1.

Changelog

Sourced from lint's changelog.

2.0.1

Update changelog

2.0.0

Requires Dart sdk: '>=2.18.0'

New package:lint/strict.yaml

New package:lint/casual.yaml

New package:lint/package.yaml

Deprecate package:lint/analysis_options.yaml (uses strict.yaml)

Deprecate package:lint/analysis_options_package.yaml (uses package.yaml)

Disable use_decorated_box

Enable unnecessary_null_aware_operator_on_extension_on_nullable

Enable unnecessary_to_list_in_spreads

Commits

e9c3494 Fix changelog

96291af Don't recommend DecoratedBox

6c6afc3 Sync casual and strict rules

e78ca73 Bump version to 2.0.0

deff1a0 Add version information

0e61a0b Update license year

5a41b61 Create casual and strict rules

f857f75 Apply Dart SDK: >= 2.18.0 • (Linter v1.24.0) rules

4f256e4 Merge branch 'dart2.18'

0c86c85 Merge pull request #62 from nohli/update-pub-links

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dependencies
opened by dependabot[bot] 0
Bump test from 1.20.2 to 1.22.0
Bumps test from 1.20.2 to 1.22.0.

Commits

173a36f prep packages to publish (#1780)

fd8e2b6 fix an issue with the github reporter (#1779)

b82fc0b Experimental wasm support (#1777)

262bc7b Bump to the latest matcher and prepare to publish (#1778)

fa81b45 Expand test_api pubspec description (#1775)

f704d5a Add scorecard badge to test repo. (#1774)

58beb14 checks: tweaks to readme (#1767)

b0a39cc pkg:test - fix version in pubspec

cdd7554 test_core: version fix before publish

fe048a4 Latest pkg:analyzer, prepare for releases (#1766)

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dependencies
opened by dependabot[bot] 0
Bump collection from 1.16.0 to 1.17.0
Bumps collection from 1.16.0 to 1.17.0.

Changelog

Sourced from collection's changelog.

1.17.0

Add Iterable.elementAtOrNull and List.elementAtOrNull extension methods.

Add a top-level lastBy() function that converts an Iterable to a Map by grouping its elements using a function, keeping the last element for each computed key. Also available as an extension method on Iterable.

Commits

ca45fc4 update CI config; prep for publishing (#251)

414ffa1 Add elementAtOrNull extensions (#217)

f9b433d Introduce a new lastBy() function (#223)

69766da Add complexity bound on binary search methods (#239)

5b43ad7 Fix analysis issue with latest dev release (#236)

e83c373 fixed maxBy compare param signature (#224)

c1a07e4 Add a comment about NaN in min/max extensions (#234)

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dependencies
opened by dependabot[bot] 0
Bump test from 1.22.0 to 1.22.1
Bumps test from 1.22.0 to 1.22.1.

Commits

09fb067 prep packages for publishing (#1814)

c8ac438 Prepare for Dart 3.0 api removals (#1812)

73cd754 Record the working directory for VM platform (#1804)

02d8764 Use Future for return type in runner main(). (#1809)

3d6039b Merge test selections by path (#1806)

4dceb87 Ignore some usage of dperecated errors (#1807)

f3d80a6 Fix missing label and reason after isNotNull (#1797)

5b1f007 Use double quotes for test names on windows (#1802)

b25dac9 checks: finish async tests (#1793)

d930d5b Add support for async soft checks (#1789)

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dependencies
opened by dependabot[bot] 0

Releases(1.1.0)

1.1.0(Dec 23, 2022)
Fixed EXDATE parsing (https://github.com/TesteurManiak/icalendar_parser/pull/44)

Upgraded dev dependencies

Refactored some code to beneficiate from enhanced enums

Source code(tar.gz)
Source code(zip)
1.0.2(Jul 8, 2022)
[1.0.2] - 08/07/2022

Added EXDATE (#37 from LucaCoduriV)

Removed dependency to collection

Source code(tar.gz)
Source code(zip)
1.0.1+1(Apr 7, 2022)
[1.0.1+1] - 07/04/2022

Updated linting rules

Source code(tar.gz)
Source code(zip)
1.0.1(Oct 4, 2021)
[1.0.1] - 04/10/2021

Fixed issue #33: Exception on ORGANIZER field parsing

Source code(tar.gz)
Source code(zip)
1.0.0(Sep 22, 2021)
[1.0.0] - 22/09/2021

Fixed fromString constructor

Full test coverage on the package

Source code(tar.gz)
Source code(zip)
0.8.1(Aug 11, 2021)
[0.8.1] - 11/08/2021

Added RRULE #30

Source code(tar.gz)
Source code(zip)
0.8.0(Jun 4, 2021)
[0.8.0] - 04/06/2021

Breaking Change: Added class IcsDateTime to replace the DateTime.tryParse ensuring no timezone data are lost (#22)

Source code(tar.gz)
Source code(zip)
0.7.0(Jun 2, 2021)
[0.7.0] - 02/06/2021

toJson() now returns a correctly formatted JSON

Removed some irrelevant tests

Refacto a few unit tests so they can use real .ics files

Added lint rules to the code

Source code(tar.gz)
Source code(zip)
0.6.0(Apr 22, 2021)
[0.6.0] - 22/04/2021

Fixed an issue with line folding sometimes causing an exception (#21)

Fix TRIGGER and SEQUENCE warnings (#22)

Source code(tar.gz)
Source code(zip)
0.5.1(Apr 21, 2021)
[0.5.1] - 19/04/2021

Fix for DESCRIPTION text that is spanned over multiple lines and contains a : (Contributor: stevenboeckmans)

Source code(tar.gz)
Source code(zip)
0.5.0(Mar 25, 2021)
[0.5.0] - 25/03/2021

Migrate code to nullsafety

Refacto some tests

Source code(tar.gz)
Source code(zip)
0.4.2(Mar 4, 2021)
[0.4.2] - 04/03/2021

Added method registerField and unregisterField to add custom fields to parsing.

Source code(tar.gz)
Source code(zip)
0.4.1(Feb 25, 2021)
[0.4.1] - 25/02/2021

Updated /example

Updated README.md

Added unit tests and code coverage

Added support for IcsStatus enum:

NEEDS-ACTION

COMPLETED

IN-PROCESS

DRAFT

FINAL

Source code(tar.gz)
Source code(zip)
0.4.0(Oct 27, 2020)
Improved unit tests

Added support for fields:

TRIGGER

ACTION

METHOD

STATUS (using IcsStatus enum)

SEQUENCE

REPEAT

CLASS

TRANSP (using IcsTransp enum)

Source code(tar.gz)
Source code(zip)
0.3.1(Oct 26, 2020)
Fixed parsing of DTSTART and DTEND

Source code(tar.gz)
Source code(zip)
0.3.0(Oct 26, 2020)
Fixed END:VCALENDAR check if ending with newline

Added parameter lineSeparator to ICalendar.fromString

Added constructor ICalendar.fromLines

Added some unit tests

Source code(tar.gz)
Source code(zip)
0.3.0-dev(Oct 26, 2020)
Pre-release

Undeprecated ICalendar.fromString and added a parameter String lineSeparator to parse the string.

Source code(tar.gz)
Source code(zip)
dev-0.2.0(Oct 26, 2020)
Pre-Release

Multiline support

Deprecate ICalendar.fromString, use ICalendar.fromLines instead (try it with example/ project)

Source code(tar.gz)
Source code(zip)
0.1.1+1(Oct 24, 2020)
Added pedantic rules to lint code

Source code(tar.gz)
Source code(zip)
0.1.1(Oct 24, 2020)
Compatible with dart::core

Authorize END:VCALENDAR ending with newline

Source code(tar.gz)
Source code(zip)
0.1.0(Oct 21, 2020)
First release

Parse an ICalendar object from a String

Source code(tar.gz)
Source code(zip)

Owner

Guillaume Roux

Flutter Software Engineer. I like to make some personal projects and post them on Github and Gitlab.

GitHub https://pub.dev/packages/icalendar_parser

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Related tags

Overview

icalendar_parser

Getting Started

How to use

Constructor

ICalendar.fromString

ICalendar.fromLines

Other methods

ICalendar.registerField

ICalendar.unregisterField

ICalendar.toJson

Supported Properties

Comments

1.6.1

1.6.0

1.5.0

1.4.0

1.3.2

1.3.1

1.3.0

2.0.1

2.0.0

1.17.0

Releases(1.1.0)

1.1.0(Dec 23, 2022)

1.0.2(Jul 8, 2022)

[1.0.2] - 08/07/2022

1.0.1+1(Apr 7, 2022)

[1.0.1+1] - 07/04/2022

1.0.1(Oct 4, 2021)

[1.0.1] - 04/10/2021

1.0.0(Sep 22, 2021)

[1.0.0] - 22/09/2021

0.8.1(Aug 11, 2021)

[0.8.1] - 11/08/2021

0.8.0(Jun 4, 2021)

[0.8.0] - 04/06/2021

0.7.0(Jun 2, 2021)

[0.7.0] - 02/06/2021

0.6.0(Apr 22, 2021)

[0.6.0] - 22/04/2021

0.5.1(Apr 21, 2021)

[0.5.1] - 19/04/2021

0.5.0(Mar 25, 2021)

[0.5.0] - 25/03/2021

0.4.2(Mar 4, 2021)

[0.4.2] - 04/03/2021

0.4.1(Feb 25, 2021)

[0.4.1] - 25/02/2021

0.4.0(Oct 27, 2020)

0.3.1(Oct 26, 2020)

0.3.0(Oct 26, 2020)

0.3.0-dev(Oct 26, 2020)

Pre-release

dev-0.2.0(Oct 26, 2020)

Pre-Release

0.1.1+1(Oct 24, 2020)

0.1.1(Oct 24, 2020)

0.1.0(Oct 21, 2020)

Owner

Guillaume Roux

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Some examples for how to build dart code using package:analyzer and package:code_builder only (i.e. no build_runner or build.yaml files)

A cli tool to run Flutter applications and auto hot reload it when files are changed

A CLI for syncing Dart dependency versions between pubspec.yaml and pubspec.lock files.

A set of commands for coverage info files manipulation.

A generator to create config class from json files that support many environments

A CLI tool to help batch renaming files.

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