esm | Lightweight communicating state machine framework
kandi X-RAY | esm Summary
kandi X-RAY | esm Summary
Good system design is often about knowing what to avoid. Unrestricted use of traditional techniques for writing concurrent software, like preemptive threading, almost always results in systems that are unpredictable and unreliable. Degradation of those two aspects is specially problematic in embedded systems where predictability and reliability are even more important than performance and/or expressiveness. Active Object Model brings the same improvements to behavioral design as Object Orientation to architectural design. Active objects are objects that encapsulate own flow of control and are designed as message pumps with Run-to-completion (RTC) semantics and explicit state machine structure. Adapting Active Object Model allows for construction of comprehensible concurrent programs. Resulting conceptual integrity has also added benefit of making it possible to spend effort on design instead of implementation. Implementation step in this method is, for the most part, mechanical process and as such, can be automated. This repository gathers all the ideas and implementation tricks around lightweight, efficient statecharts and AOM implementation in C. Inspired by [QP framework] It’s basically a simple cooperative priority-based scheduler and a (hierarchical) state machine framework. Some implementation techniques and design patterns (like Embedded Anchor and linker-section-based plugin system) are borrowed from Linux kernel. Another interesting feature is the possibility of running the system without delays, so as fast as possible. Having the inputs defined explicitly makes mocking them out easy and then linking with the test platform produces a binary that can generate an execution log containing days worth of system operation in seconds. Then it’s easy to analyze the log (e.g. in an Excel spreadsheet) for safety/liveness properties. Sort of poor man’s model checker :smiley:. Provided are following examples/demos: - [simple blink] apps/blink) - hierarchical state machine transitioning between two states and reacting to a button press - [Dining Philosophers Problem (DPP)] apps/dpp) - originally formulated in 1965 by Edsger Dijkstra - [cigarette smokers problem] apps/smokers) - classical problem originally described in 1971 by Suhas Patil - [pelican crossing simulation] apps/pelican) - simplest safety-critical system simulation - [producer-consumer simulation] apps/prodcons) - two producers requesting actions on a single resource guarded by a bus module. There are also two more complex apps: - [sk6812 LED strip mood lamp and clock] apps/clock) with RTTTL alarms and sunrise simulator - [USB HID keyboard firmware] apps/keyboard) - more lightweight QMK alternative.
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QUESTION
I'm using Node 16.3.0 and Express 4.17.1 (though my Node version is flexible)
I have a session.js
file that's like this:
ANSWER
Answered 2021-Jun-12 at 19:02Problem in your code is that you are mixing the ES modules with CommonJS modules.
By default, node treats each javascript file as a CommonJS module but with the following in the package.json
file
QUESTION
I'm trying to purchase a stock but when I click on buy and then see my Portfolio.vue, 'm getting the error as below
vue.runtime.esm.js?2b0e:619 [Vue warn]: Error in render: "TypeError: Cannot read property 'find' of undefined"
found in
...ANSWER
Answered 2021-Jun-10 at 19:26That specific error is coming from your stockPortfolio
getter, specifically, this line:
QUESTION
I am learning MERN and starting of the backend section I learned that we have to enable ESM in package.JSON to use import and export but in building frontend with react nothing has to be done
...ANSWER
Answered 2021-Jun-10 at 12:10React itself doesn't care.
Whether you do or don't need to configure anything depends on the tools you use for your frontend development.
Eg. create-react-app and Vite configure the bundlers they use to work with ESM, but if you start from scratch, with e.g. your own Webpack configuration, you'll need to figure out the configuration yourself.
QUESTION
When should you use this syntax:
...ANSWER
Answered 2021-Jun-09 at 14:06https://www.typescriptlang.org/docs/handbook/modules.html#export--and-import--require
Both CommonJS and AMD generally have the concept of an exports object which contains all exports from a module.
They also support replacing the exports object with a custom single object. Default exports are meant to act as a replacement for this behavior; however, the two are incompatible. TypeScript supports export = to model the traditional CommonJS and AMD workflow.
The export = syntax specifies a single object that is exported from the module. This can be a class, interface, namespace, function, or enum.
When exporting a module using export =, TypeScript-specific import module = require("module") must be used to import the module.
QUESTION
Over many years I've struggled with this same issue. I cannot seem to work out how to use a JavaScript library from TypeScript, reliably.
I seem to get it working by accident and then move on and not revisit such code for years until a extrinsic change forces a breakage, like today when I updated VS 2019.
I've spent days reading about modules and requires and loaders, but I get more and more confused.
Example. I want to use DayJS in a TypeScript .ts
file I am writing.
Here's the sample code.
...ANSWER
Answered 2021-Jun-04 at 18:38I share many of the same frustrations! It's so hard to get Typescript working nicely with Javascript and the microsoft documentation is so obtuse!
In your case : the path to a library is always looked for in node_modules
so in that case you don't need to add the full path.
You also never need to import
a .d.ts
file. You can just put the .d.ts
file somewhere in your working folder and VS Code will detect it.
If you have the .d.ts
file for moment.js
, you will get type completion in VS Code. You don't need to import moment.js
when you load it with a
QUESTION
I'm a JavaScript beginner. I do not use a "bundler".
For a few days now I've been trying to use moment.js and other date-time libraries in some JavaScript by importing it using ES6 modules (ESM).
I have a JS module I wrote, which is transpiled from TS, and that has this line:
...ANSWER
Answered 2021-Jun-08 at 17:47You want to import a bundled version of the lib to be able to do that. Try:
QUESTION
I am trying to get Monaco Editor to work in my application to allow editing of YAML. I can get it work, but the console is complaining that regeneratorRuntime is undefined, so the web workers are likely not working.
...ANSWER
Answered 2021-Jun-07 at 14:35I got it working in the end. One of the things I did not mention was my Rails version (5.1.6). I upgraded this to 5.2.x so that it is in sync with webpacker 5.4. This brought in some changes to the structure, including new babel and postcss files.
I also installed corejs and regenerator-runtime and now everything is working perfectly.
Lesson learnt, check compatibility before upgrading anything!
QUESTION
I tried to follow the guide at Question, which results in a
...ANSWER
Answered 2021-Jun-02 at 20:11It seems you have run into an issue with the starter. In main-view.ts
, it loops over the routes with a title and tries to create a link for each in the menu:
QUESTION
As the title suggests, when I run npm start
in my project folder the I get the following error:
ANSWER
Answered 2021-May-18 at 16:31Did you try amplify init
? Look at the docs and install all the dependencies. https://docs.amplify.aws/start/q/integration/js?sc_icampaign=start&sc_ichannel=docs-home
QUESTION
The tests in my project were working fine when I first started using them, currently they have stopped working at all.
Whenever I use the test command the following error is thrown:
...ANSWER
Answered 2021-Jun-03 at 11:08I encountered the same problem.
Apparently, the csv-writer
package contains tests, like array.test.ts
specified in your stack trace.
This is your script used for running the mocha tests:
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